What investigators have just taken. And the face revealed. Who is the mystery doctor . G good evening. And we begin tonight with that deadly disaster, the explosion here in the u. S. That took the lives of 15 and destroyed dozens of homes. Tonight, authorities have now revealed it was, in fact, a criminal act. It began with a fire at a fertilizer plant in west texas. And the massive explosion that followed, registering as strong as a magnitude 2. 1 earthquake. So many lives lost on that night. Hundreds, in fact, were injured. But this evening, three years and 400 interviews later, what authorities have just revealed, as they now issue a major reward for help. Abcs phillip mena is in texas. Reporter we remember that father in the car with his daughter you okay . Yeah, i cant hear. Reporter the explosion. The fear. Please, get out of here. Oh, my god. Reporter the blast, the smoke seen from all over town. Families sheltering one another. Cowering behind cars. Roofs collapsed. The top floor of this apartment complex torn off. Oh, my god. Peoples houses are on fire. Reporter homes, neighborhoods on fire. Rescue teams racing in to help. Oh, my god. Reporter 15 killed. Hundreds injured. And tonight, federal and state investigators say the fire that triggered the deadly explosion at a fertilizer plant in west texas was intentionally set. The fire has been ruled as incendiary. This means this fire was a criminal act. Reporter authorities telling us, the hunt is on tonight for the perpetrator or person tray torps that took the lives or so many. We want the community to know that we havent forgotten about those 12 First Responders and the three other individuals living their lives. So, we owe it to them to go where this investigation leads us. Reporter lee years later, the town is still recovering. The community, the school here, coming back to life. And driving through neighborhoods today, we saw street after street rebuilt. Vy talbot, happy to be home. You moved back . Yes, yeah. And phillip mena with us from west texas. And you can see there behind you, phillip, no sign of that plant that once stood right there. Any leads tonight after those 400 interviews . Reporter well, thats right, david. This empty lot behind me is all that is left from the blast. Authorities telling me tonight, they are following leads, but so far, no arrests, and no suspects. And tonight, a 52,000 reward is being offered. David . Phillip mena, thank you. We are also learning much more this evening about that deadly rampage inside an american mall. The suspect ramming his stolen car right through the door of that Department Store and then slashing victims at random. Some did not survive. And tonight, we hear from shoppers inside, as this all unfolded. As we also learn of an offduty officer who jumped in. Abcs gio benitez is in massachusetts. Reporter this mall, now a crime scene. 28yearold Arthur Darosa checked himself into a hospital monday night. His sister told police he had been acting in a disturbed manner. But was released the next morning. He left his childs soccer program. Shortly after, crashing his car. Then, police say, he entered a random house where he stabbed 80yearold Patricia Slavin and her daughter kathleen. They were taken to the hospital, where patricia later died. At 6 40 p. M. , darosa allegedly drove that crashed car here to the galleria mall, slamming into the front of macys. Assaulting at least three women before running to the bertuccis restaurant. He was slashing people. Reporter stabbing a waitress. 56yearold george heath tried to stop the attack. The suspect allegedly stabbing heath. I lost a good man. Reporter offduty sfs deputy james kreeld fired a single bullet. The deputy, being called a hero tonight. And dave, behind me, you can see that boarded up entrance from the car crashed. Meanwhile, weve learned tonight that the waitress who survived is pregnant. Shes in serious condition right now, david. Gio benitez from massachusetts tonight. Thanks, gio. A Major New Development this evening in the case that captured national attention. Federal charges have been filed against Michael Slager, after the shooting death of walter scott in South Carolina in this field. Slager shooting scott eight times. Tonight, an historic move from the federal government against the officer. Abcs Steve Osunsami was in the charleston courtroom as the indictment was read. Reporter 34yearold Michael Slager is now the first. The first former Police Officer from one of the many racially charged police shootings, to face federal charges. Registration and insurance card . Reporter it all started with this traffic stop and a broken tail light a little over a year ago. No registration in there, no insurance . No, he has all that stuff. Reporter 50yearold walter scott, worried about Child Support issues decided to run. And heres where the federal grand jury says slager went too far. Handcuffed and shackled in court today, he heard the three charges, including allegedly lying to investigators before this video, first revealed by abc news, told a different story. The most serious charge means life in federal prison if hes convicted. Deprivation of civil rights under the color of law accuses him of abusing his authority as a Law Enforcement officer, by using unreasonable force. Slager is pleading not guilty, saying it was selfdefense. Outside court, Walter Scotts mother wept for her son. I thank god for justice, and i claim it and i stand on the word. Reporter slager is home tonight, wearing a gps tracking device, and using the same half a Million Dollar bond from his state murder case. For now, that trial is still scheduled for october. David . Thank you, steve. Next, to new developments after the deadly attack on a planned parenthood clinic in colorado. Tonight, a judge ruling that the gunman, robert deer, is mentally incompetent to stand trial. Deer has confessed to killing three people at the clinic last november, claiming he was a, quote, warrior for the babies. Deer will be sent to a psychiatric hospital. Now, to the growing firestorm over donald trump and his tax returns. He has not released them. Trump saying he is being audited, and that his taxes will be made public when the audit is complete. Tonight, what if thats not until after the election . And, we ask, does an audit prevent a candidate from revealing their taxes . Abcs tom llamas on what weve just learned. Reporter donald trump loves to boast about his fortune. Im worth over 10 billion, and i dont say that bragging, folks. I have tremendous cash flow. Im really rich. Ill show you that in a second. Reporter but so far, hes refusing to prove it. And tonight, the Associated Press reporting trump says he may not release his tax returns until after the election, adding, quote, theres nothing to learn from them. But just three days ago, trump signaled he wanted those returns out from november. You dont learn much from tax returns. But i would love to give the tax returns. Reporter now, trump could be the first major president ial candidate in 40 years to refuse to release the information. Tonight, Hillary Clinton asking, what is trump hiding . My husband and i have released 33 years of tax returns. So, you got to ask yourself, why doesnt he want to release them . Yeah, well, were going to find out. Reporter trump has waffled on releasing his returns for months. In february, tweeting this image, signing a recent tax return. Isnt this ridiculous . That same month, this explanation. I will absolutely give my return, but im being audited now, for two or three years, so, i cant do it, until the audit is finished, obviously. Reporter hes not the first candidate reluctant to disclose their returns. In 2012, david asking mitt romney why he wouldnt reveal his taxes. Can we clear this up by asking you a simple yes or no question . Was there ever any year when you paid lower than 13. 9 . I havent calculated that. Im happy to go back and look. Reporter romney ultimately did release his tax returns well before election day. And tonight, hes slamming trump for not doing the same, calling it disqualifying, adding theres only one logical explanation. There is a bombshell in them. And tom llamas with us live tonight. Is there anything in federal law that prevents trump from releasing his tax returns s if hes being audited by the irs . Reporter david, we reached out to tax experts and they tell us, regardless of the audit, there is no law preventing trump from releasing his tax returns. This is his choice. David . Tom llamas with us tonight. Thanks, tom. Next, to a dangerous night ahead for millions. Tornado warnings in effect. Severe storms from texas all the way up through the carolinas. A flash flood emergency near nashville, tennessee, creating chaos. And tonight, the National Weather service now declaring that this monster tornado right here in oklahoma was an ef4. Abcs alex perez on what that means about its size, and the speed of those winds, as they now fear more coming tonight. Reporter blinding rain and howling winds making for a dangerous commute in st. Louis. A tree falling onto three homes. Extensive amount of damage has been caused. Reporter firefighters onscene. Earlier, high water and debris trapping families northeast of nashville. Praying, doing a lot of praying. And it worked. The good lord brought us through it. Reporter its the same system that dropped this tornado in mayfield, kentucky. There it is. Look at that house, its gone. This is where my house was. Reporter today, we met brittany jackson. Thats her home, now wrapped around that tree. I was hysterical when i seen it. All i could do is cry and say, my house is gone. Reporter and tonight oh, no. Reporter the National Weather service says that massive tornado in wynnewood, oklahoma, was an ef4, with winds up to 175 miles an hour. By far, the strongest tornado of the year. And david, heres a closer look at whats left of brittany jacksons home. The steel frame bent like a wire around this tree. Tonight, officials telling us the tornado here, a powerful even f3, 140mileperhour winds. David . All right, alex, thank you. Overseas tonight, and our Martha Raddatz has just touched down in iraq, in baghdad, three separate car bombs spreading terror and taking lives. Isis tonight claiming responsibility. And here are the images. We learned membersle of several bridal parties were among the victims. The violence in iraq, just as more american troops are sent to the region, even closer to the front lines against isis, and martha and her team are there. Reporter the most violent day in baghdad this year began with an isis car bomb. Ripping apart this market, killing 63. Reportedly among them, brides and grooms getting ready for their weddings. Two more car bombs exploded in other parts of the city, taking at least 93 lives in total and wounding hundreds. And as the danger increases here, more american troops are heading into harms way. About 200 additional troops are soon to be deployed as advisers to the iraqi army, but they will be closer to the front lines than ever. Just last week, adviser and navy s. E. A. L. Charles keating iv was killed in a fire fight with isis. The third american combat loss since the u. S. Forces returned to iraq. Despite the recent violence, the u. S. Says the Iraqi Military has retaken momentum from isis. As the enemy loses more and more terrain, they resort to some of these desperate acts. And martha joins us now from baghdad. As you reported there, more american troops are now headed into harms way and the fight against isis there. So, is eye us losing ground and getting more desperate . Reporter david, isis has lost significant amounts of territory, but they still hold mosul. And theres very little change the iraqis and americans can take it back by the end of this year. So, that will be on the shoulders of our next president. David . All right, Martha Raddatz just touching down in iraq. Martha, thank you. Meantime, back home and the new details in fight against isis here. James comey revealing today, the agency is tracking nearly 800 isisrelated cases right here in the u. S. , than the number continues to go up. But comey also said that isis is attracting fewer terror recruits from this country to iraq and to syria. We turn next here tonight to your money, and anyone who pays property taxes, taxes for your local School District will want to weigh in on this one. In one community in texas, a heated debate tonight, after moving forward, spending 63 million for a High School Football stadium. 63 million. Heres abcs matt gutman. Reporter High School Football is big clear eyes, full hearts, cant lose. Cant lose reporter stadiums are getting even bigger. The town of mckinney, texas, just voted to build this giant 12,000seat stadium. The price tag, colossal. Nearly 63 million. The decision, not without controversy. Please vote no. Reporter critics say taxpayers should not be pumping this much money into High School Football. Weve got a perfectly fine stadium. Reporter but the School District is hinting at what you might call Texas Stadium inflation. Pointing to behemoths like the ones in cady and allen, texas. Both priced at about 60 million. The School District assures us it will be a multipurpose facility, david, and besides, they say, they want their kids to get the same opportunities as the kids get at the other schools. David . Matt gutman tonight. Matt, thank you. And tweet us from home, let us know what you think. In the meantime, theres still much more ahead on world news tonight this wednesday. New details coming in now about what authorities have just taken. Also, there are new clues about princes final days, uncovers in a search warrant. And this face, revealed tonight. Who is the mystery doctor . Also, the massive crane collapse in new york city. And tonight, the new headline involving that investigation. And, is this the future of travel . 400 Miles Per Hour in two seconds. Well, this was the test today, in an american desert. And what happened. Right after the break. To you, theyre more than just a pet. So protect them with k9 advantix ii. It kills fleas, ticks and mosquitoes. K9 advantix ii. For the love of dog. Itsand your doctor at yoto maintain your health. A because in 5 days, 10 hours and 2 minutes you are going to be 67. And on that day you will walk into a room where 15 people will be waiting. 12 behind the sofa, 2 behind the table and 1 and a half behind a curtain. Family surprise but only one of them will make a life long dream come true. Great things are ahead of you when your health is ready for them. At humana, we can help you with a personalized plan for your health for years to come. Next tonight, new developments in the prince investigation. A search warrant now revealing the doctor in minnesota who recently prescribed drugs and saw prince the day before he died. Abcs eva pilgrim with the video outside minneapolis. Reporter tonight, new questions about princes visits with a minnesota doctor as investigators conduct fresh searches at the singers estate. Law enforcement is looking into whether prince died of a drug overdose. A search warrant reveals dr. Michael schulenberg arrived at princes home the morning he was found dead, telling police he was bringing medical test results to prince. The doctor, seen here talking about health care in this youtube video, told police he saw the singer on april 7th and on april 20th. The day before his death, saying he wrote him a prescription to be filled at walgreens. Prince spotted at the walgreen that same day in this tmz photo. Authorities have searched both the drug store and the Doctors Health network. Taking any and all medical records, for prince rogers nelson. Theres going to be a microscope on this doctor now, in terms of why did he prescribe it, what he did prescribe, and what were the circumstances surrounding it . Reporter schulenberg no longer works at the clinic and tonight there is no answer at his home. We tried to reaching to dr. Schulenberg and his attorney and they have no comment. David . Eva, thank you. Next here tonight, bidding farewell to a familiar face for so Many Americans on sunday nights. And more on the deadly crane collapse in new york city. And the queen tonight, her audio caught, in this candid moment here, what she said about the chinese. Look, the wolf was huffing and puffing. Like you do sometimes, grandpa . Well, when you have copd, it can be hard to breathe. 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The possible future of travel tonight. The first test today of the hyperloop, designed to go to l. A. From San Francisco in just 30 minutes. The system unveiled outside las vegas today. An unmanned sled going from 0 to 400 Miles Per Hour in two seconds. Crashing into a pile of sand, because they havent built the brakes yet. Well, after so many sunday nights, morley safer is retiring from 60 minutes. At 84 years old, safer has been a mainstay on cbs for more than 50 years. He will formally retire this week, calling it, quote, a wonderful run. And we wish him well. It wont be the same. When we come back here tonight, the American Mother making history at the invictus games. The inspiration that keys her going. Bob woodruff with america strong. You both have a perfect driving record. Perfect. No tickets. No accidents. That is until one of you clips a food truck, ruining your perfect record. Yeah. Now you would think your Insurance Company would cut you some slack, right . 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See your doctor if your asthma does not improve or gets worse. Ask your doctor if 24hour breo could be a missing piece for you. See if youre eligible for 12 months free at mybreo. Com. Finally tonight here, america strong. The mother and former marine, taking home americas first gold medal at the invictus games, revealing to us today her hidden inspiration. Bob woodruff with the champion. Reporter sara rudder, not letting anything slow her down. Rudder beginning to pull away a little bit. At the tape, it will be rudder. Reporter representing the u. S. , shes won seven medals. Including teams first gold. A retired marine lance corporal, sara was at the pentagon on september 11th and aided in the rescue missions. One her left ankle was crushed by debris. Five surgeries, years of pain, she decided to amputate her leg. Tonight, showing us all how to get back up. Tell me about this. Right here. That woman, superwoman and wonder woman. Superwoman is one of the greatest women i know and to know that a woman is known for her strength, i want to be known for that, as well. Were putting our heart and soul out on the line for our country, just like we do in battle. And were here to represent. We salute sara tonight. Bob, thank you. The invictim games tonight on the invictim games tonight on espn2, and i hope to listerine® kills 99 of bad breath germs. The invictim games tonight on espn2, and i hope to this is 100 useful for a 100 fresh mouth. Whats it like to not feel 100 fresh . We dont know. We swish listerine®. As do listerine® users. The very people we studied in the study of bold. People who are statistically more likely to stand up to a bully. Do a yoga handstand. And be in a magicians act. Listerine® kills 99 of bad breath germs so you can feel 100 in life. Bring out the bold™. From washington, d. C. , this is the jeopardy teachers tournament. Here is our third group of semifinalists a Highschool History teacher from lake wales, florida. A highschool english teacher from mystic, connecticut. And a sixthgrade english teacher from somerset, new jersey. And now, from dar constitution hall, here is the host of jeopardy alex trebek. [ cheers and applause ] thank you, johnny. And thank you again, ladies and gentlemen. Well, two women are waiting in the wings, eager to come back tomorrow and friday to play for 100,000. Who will join them lauren, cory, or jason . Well find out in this halfhour, wont we . So, lets go to work in the jeopardy round. Here are your categories in play today