Good evening. Police in waco, texas, had a lunch a planned weekend gathering of bike per gangs would go bad, but nothing like the violence that broke out before their eyes. Gun fire stabbings and beatings as members of criminal gangs waged battle with each other and turned on police in a restaurant parking lot. When it was over nine people were dead 18 injured, 170 arrested. Tonight we are learning more about the groups involved as police brace for possible retaliation attacks. Our National CorrespondentMiguel Almaguer is in waco tonight with the latest. Reporter Police Called the crime scene at the twin peaks bar grill among the most violent is and gruesome they have ever seen. A brawl between five rival motorcycle gangs leaves nine dead and 18 wounded. At last count we have 170 individuals that we have arrested. Those individuals are being charged with engaging in organized crime in reference to the shooting at twin peaks which is a capital murder. Reporter what started as a fistfight in a bathroom turned into a rumble, with brass knuckles knives chains and clubs before the wild shootout poured into the parking lot. We were panicked initially. You know when a man ran are in everybody a lot of people startedducking. Reporter innocent diners caught in the middle. More than a hundred weapons recovered. Nobody was doing anything. They started shooting people. I dont know what the problem is. Reporter with gangs under Surveillance Police in the parking lot responded quickly. To innocent bystanderer rers hurt. This can happen in any town across the united states. Unfortunately they chose to be here on a sunday in waco texas. Reporter with the tell vegas drama sons of anarchy pop la rising motorcycle culture investigators jay dobbins who infiltrated the hells angels say they often battle over drugs and turf. It is a nasty, bloody vomitcovered existence. There is nothing sexy about it when youre in it. Reporter motorcycle gangs like the bandidos said to be behind sundays shooting are as dangerous as ever. The bandidos are an International Organized Crime syndicate. These events that we yesterday in texas, they happen all the time with these guys. Reporter tonight with motorcycle gangs vowing retaliation, police say their officers have now become targets so they have stepped up patrols. Officers have been critical of the Restaurant Management here saying they were warned of the potential of violence and did nothing to stop it. Management said they were working with police but the franchise ownowner, the corporate ownerer agrees stripping the franchise of the franchise title is. Miguel thank you. Tonight, as amtrak resumes full service up and down the northeaster corridor for the First Time Since the deadly derailment in philadelphia there are new turns in the investigation. The feds weighing in on the theory that something may have struck the train moments before disaster. Nbcs tom costello has late details. Tom . Hi, lesterer good evening. The key questions are why was the train speeding and was it along with two other trains hit by a projectile minutes before 188 went off the tracks . Tonight, the fbi says the shattered glass on the derailed amtrak train was not caused by a bullet but the ftsb hasnt ruled out that another projectile was thrown at the train, possibly disorienting the eng mere who was new on the tracks. Two other trains may have been hit. In philadelphia this morning you were the first this line . First one. First one in line gets a hug huh. Oh yeah reporter the mayor was on hand as the first passenger s left for new york. 40,000 amtrak passengers traveled the northeast corridor every day. With the line shut down since tuesday most were ready to climb aboard. I trust amtrak executives and all the amtrak people would not put us on the trains if they didnt think it was safe. Im sure they have done the work and installed the right equipment. Reporter it was one with of amtraks Biggest Challenges in 20 years. Ce o board man telling me new government ordered safety upgrades are in place. Everybody on the railroad is emotional about this. Its focused and committed to safety. This is a safe railroad to ride. We know it. Reporter among safety upgrades an automatic braking system along the stretch of track that until the crash had none. As we saw firsthand, a new speed limit for trains in the year of the disaster. We have really slowed down here. This is the scurve where train 188 derailed after doing double the posted speed limit. The new rules require engineers to come into this curve at 45 down from 50. Engineer Brandon Bostian has told investigators he cant remember the events leading up to the crash. Funeral ares for laura finaer more Rachel Jacobs and bob gildersleeve. Today an assistant conductor last week said maybe she heard something over a garbled raid yes channel that maybe the eng theer was, in fact reporting he had been hit, maybe by gun fire. Thousand the ntsb says there was no recording of any such radio traffic and all radio traffic is recorded. Lester . Tom, thank you. A major move by president obama drawing a line on heavy duty militarystyle equipment used by local Law Enforcement after the nation witnessed scenes between protesters and police who were look inging more like soldiers on american streets. There were questions about whether it would tie the hands of police in some instances. Ron allen has more. Reporter after months of confrontation on americas streets, president obama today banned the federal government from giving some military equipment to local police. We have seen how militarized gear can sometimes give people a feeling like there is an Occupying Force supposed to a force thats part of the Community Protecting and serving them. Reporter prohibited equipment includes tracked Armored Vehicles weaponized aircraft grenade launchers. On the restricted list, Armored Vehicles riot gear specialized ammunition only available if approved through a rigorous process. In ferguson we saw tactical officers in a bearcat, anner Armored Vehicle able to with stand impact from a machine gun. A precision rifle with a range of 500 to 800 yards. The police warned the protesterers to clear the area. The protesters say they are not going anywhere. The police are starting to move in. Reporter nationally some 600 mine resistant vehicles are in use. Humvees, machine guns camouflage helicopters and planes. Much of it acquired after 9 11 as local Police Became the front line in the war on terr camouflage fatigues are are aggressive i think bricks bottles and sticks are just as aggressive. Reporter police point out dozens were injured if baltimore. Two cops shot in ferguson. We have to match force with force. Reporter the president praising camdens police force and communitybased approach. More officers on the streets. Violent crime down. The city that was the murder capital of the nation. The white house released a final list of recommendations for police. Everything from body cameras to sharing more data with the public about police work. The goal to try to restore trust. Lester . Ron allen, thank you. Turning overseas where isis has overrun the city of ramadi a city with a lot of meaning to a lot of american families. Not only the capital of an bar province but where one of three american casualties occurred. Ramadi less than 70 miles from baghdad is now in the hands of the enemy. Nbcs bill neely has our report. Reporter the retreat from ramadi was fast and humiliating. Iraqi troops in dozens of Armored Vehicle s in a race for their lives. Forcing them out, isis fighters who shot this propaganda video showing a city abandoned by the army. Isis gunmen controlling the hospital in the citys center. Iraqi troops fought for just two days leaving behind americansupplied weapons and tanks. Its a setback for the u. S. A decade ago, nbc news was in ramadi where hundreds of american troops gave their lives to hold the city. Today, ramadi is held by the worlds biggest terror group. It will be tough to retake. It is possible to have are the kind of attack we have seen in ramadi. I am confident in the days ahead that will be reversed. Reporter u. S. Air strikes pounded isis positions around ramadi for weeks. It didnt work. Air power has its limits. The fall of ramadi i mean its huge. Reporter critics like senator john mccain are calling for u. S. Boots on the ground which the Obama Administration has so far ruled out. Both the u. S. And iraq will rely on shiite militias to retake ramadi. They helped regain tikrit last month but they are armed and backed by iran. Its influence is growing. The u. S. Is uneasy. Iraqi Officials Say isis or dash in arabic will be beaten. No one here believes dash is going to survive in iraq or for much longer. Reporter isis is now pushing toward the capital baghdad. With u. S. War planes and iraqi troops struggling to defeat it. Nbc news london. A tragic moment in hawaii. A marine was killed when an osprey aircraft came the in for a tough landing during a Training Exercise yesterday. 21 others had to be taken to the hospital. This happened the same day six other marines who lost their lives were identified after they went down aboard a chopper while on a re leaf mission in nepal. A lot of people are talking about the incredible claims made by a computer expert who says he successfully hacked into an airplanes controls from his seat in the cabin of the plane. So many wondering if its possible and if it is, who else could be trying it . Nbcs kerry sanderers is getting answers. Reporter Chris Roberts claims he hacked into a commercial airlines cockpit flight controls. It is definitely possible to pan plait electronics through the Inflight Entertainment system and Satellite Communications to get to the aif i dont know nicks of an airplane. Reporter in an affidavit roberts said he hacked into the flight Management Systems and in one case caused one of the engines to climb resulting in lateraler or sietddeways movement. I dont believe it. Ier consider it to be garbage. Reporter today, two government sources close to the investigation tell nbc news initial Data Analysis shows no proof of robertss claim. A federal report says that doesnt mean a hack is simply fantasy. The gao just issued a report. And the experts they spoke to said any cockpit thats linked to the outside world should be considered vulnerable and, in their words, open to malicious actors. The way we connect the systems using internet protocols, nerthey are going to be more vulnerable. Reporter roberts was on boeing 737s and 757s. Experts say today dont have are the advanced wildfire system and therefore cannot be hacked. On the ourbus a 320 the fly by wire system is closed. Despite no proof of claims one of the airlines on which roberts was a passenger united banned him from their flights forever. Kerry sanders nbc news miami. The re lentless rain in the countrys mid section took a devastating turner for a louisiana family when flash floods swept away a car by a grandmother taking her grandkids to school. One of the children was later found dead. In texas, the National Guard had to use a helicopter to rescue those stranded by floodwaters. There is a lotter more to tell you about this monday night. New twists in a baffling murder mystery. A family killed in their multimillion dollar hope. A person of interest caught on camera. Tonight we are going to tell you about the strange activity in the neighborhood observed in the days before the murders. Later, when you cant find the right words to say to someone you love one woman says she has just the message and its catching on. Nd my constipation and belly pain have my stomach feeling all knotted up. Ive tried laxatives. But my symptoms keep returning. My constipation feels like a pile of bricks. That keeps coming back. Linzess can help. Oncedaily linzess treats adults with ibs with constipation or chronic constipation. Linzess is thought to help calm painsensing nerves and accelerate bowel movements. Linzess helps you proactively manage your symptoms. Do not give linzess to children under 6 and it should not be given to children 6 to 17. It may harm them. Dont take linzess if you have a bowel blockage. Get immediate help if you develop unusual or severe stomach pain especially with bloody or black stools. The most common side effect is diarrhea, sometimes severe. If its severe, stop taking linzess and call your doctor right away. Other side effects include gas, stomacharea pain and swelling. Bottom line, ask your doctor about linzess today. We are back with new twists in a shocking murder mystery in washington. A family found dead inside their burning mansion as authorities release Surveillance Video of a person of interest caught on camera. And we are hearing for the first time about strange messages in the hours and days before the murders. We get the latest from our National Correspondent peter alexander. Reporter tonight after this multimillion dollar home was found burning in one of washington, d. C. s most exclusive neighborhoods the mystery is growing. Who killed sa arksasavo savopoulos,s i wife amy, their son and a housekeeper. All four murdered inside. They were a very lovely family. Very nice family. Reporter for the first time we are hearing from a second housekeeper who asked not to be seen on camera speaking to our Washington Station wrc. She received a call from mr. Savopoulos last wednesday, the night before the fire,er telling her not to come the work the next day. He said i hope you can get this message. My wife is sick. My son is sick and vera offered to stay overnight but her phone is dead. Reporter mrs. Savopoulos followed up with a text thursday morning. Police suspect the attack may have started as early as wednesday. Neighbors reported unusual activity around the family home before the murders including an aggressive doortodoor sales man and a possible prowler. There were no signs of forced entry and investigators are looking for a person of interest seen in this surveillance rid owe. Thortds is suspect that person of interest was driving the familier porsche, later found torched, 15 miles away. Its going to be a black porsche convertible. Its going to be behind the church. Reporter the savopouloses have two teenaged daughters believed to be at boarding school. On mothers day, days before the attack abigail reportedly posted a moving message to her mom on facebook. Thank youer for the past 19 years and i look forward to the many more to come she wrote. I love you so much. A murder mystery haunting the nations capital. Peter alexander, nbc news, snews washington. When we come back a daredevils final dive. What went wrong in the dark of night in yosemite . Allergies can distract you. So when your symptoms start, doctors recommend taking nondrowsy claritin every day of your allergy season. With claritin, you get powerful, nondrowsy relief 24 hours a day, day after day. 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Over the weekend potterer and his friend leaped at Yosemite National park wearing wing suits and didnt survive. Officials are investigating what went wrong. Basejumping is illegal at yosemite. Around the world some 200 basejumperers is have died since 1980 including sean leery who died in a similar wing suit incident in utah. Climbing greats paid tribute to potter including Kevin Jorgensen who climbed el capitan saying sad day for the climbing tribe. We lost a legend are. I was inspired by how dean relentlessly pursued his passions. Until the end almost super human. Jacob rascone, nbc news los angeles. On a different note a few twitter users got an unusual notification today youre being followed by the president of the united states. After six years, president obama has his own personal twitter handle potus. His first tweet read,er hello twitter. Its barack. Really six years if ss and they are finally giving me my own account. 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Creating more programs for these little bookworms. Bringing a taste of louisiana to the world. At chase, were proud to support our grant recipients and Small Businesses like yours. So you can take the next big step. Finally tonight sometimes finally tonight sometimes its hard to put our feelings into words. A lot of us let greeting cards do it for us. There are times when the usual sentiments cant capture what we need to say. Heres nbcs anne thompson. Reporter as a greeting card writer Emily Mcdowell knowser ss words matter. Her line a quirky honest twist on gel gwyneth well cards. The best seller is let me be the first to punch the next person who tells you everything happens for a reason. Reporter whats the chord you have struck . I think it is reflecting peoples reality if a way that they have never seen before in pop culture. Reporter sentiments that come from mcdowells own experience. I had cancer myself when i was 24. I had hodgkins lymphoma. Reporter she underwent nine months of chemo and radiation. Some of her friends disappeared and well meaning people said cringe worthy things. My uncles girlfriend had that ending the story with she passed away. Reporter now the experiences are reflected in the card. Im sorry i havent been in touchment i didnt know what to say. In remission, mcdowell put her Cancer Experience away until her best friend amy died of the disease. She quit her ad agency job to eventually write cards. What began with a ral valentine is now a Los Angeles Based business with cards and gifts in 1500 stores and growing. We are swamped which is fantastic. Yeah. Reporter whats been the most emotional part for you . Reading stories. I found myself in tears as you beautifully described your experience the motivation behind the line. When i read emilys cards i thought this is what we need. We need an opportunity to start the conversation. Reporter finding funny, honest words to acknowledge the pain of disease and loss. Anne thompson nbc news los angele us on this monday night. Im lester holt. For all of us at nbc news thank you for watching and good night. Rights camera access. Have you met her . I have. I think you know everything. And what was that like . Kim kardashian. The access interview. Im billy bush. Going far beyond the revelations of the about bruce special. I remember i was literally shaking. Um because you never told