Nightly news begins right now. Announcer from nbc news World Headquarters in new york, this is nbc nightly news with lester holt. Good evening. Its a major American City dealing with an epidemic of violence. The shooting of a man in broad daylight on the streets of chicago, apparently captured on his own camera phone, have brought into jarring focus a surge in shootings that has made this the most violent start of the year that city has seen in two decades. The jump in shootings close to double the number from this time a year ago. Nbcs blake mccoy has details. Reporter this cell phone video making the rounds on social media appears to show the moment a man is shot in broad daylight. Chicago police say the man shot is a known gang member in Critical Condition tonight, while the video is shocking, shootings in chicago are increasingly not. A whopping 677 through the end of march, compared to 359 shootings this time last year. The violence in these streets is blamed on gangs and illegal guns, with bullets flying, kids often find themselves in the crossfire. One week ago tonight, 13yearold Zarriel Trotter was hit by a stray bullet while walking home from a basketball game with friends. He remains in the hospital. Hes going to fight. Hes going to struggle, and im going to pray. Thats what we do. Reporter in a sad coincidence, trotter appeared in an antiviolence psa just last year. I dont want to live around my community where i got to keep on hearing and hearing people get on getting shot, people keep on getting killed. Reporter chicagos new Police Superintendent is vowing to fight the gun epidemic. Yesterday alone, nine people shot, two of them killed in less than an hour. They are destroying our communities. Theyre destroying families, and it has to stop. Reporter but the parents who live in these neighborhoods tell me the police are already here. You dont think anythings going to change . I hope it does, but so far we havent seen any change. Reporter Norma Johnson doesnt let her 9yearold walk down the street. A bullet dont have a name on it. Reporter the bullets dont have names, but the victims do. Blake mccoy, nbc news, chicago. Neighborhoods under siege in an American City. As we head into the weekend, wild weather is making news tonight from north to south. In the southern half of the country, its tornadoes continuing to fire up and cause damage. And in the north, its balmy temperatures about to take a dramatic plunge. A 40degree swing, and snow on the way. Nbcs Miguel Almaguer has details. Reporter for the Third Straight day, hail, flooding, impossible tornadoes. A dangerous storm system threatening 9 Million People across the southeast today. In georgia, the town of Warner Robins inundated with major flooding. This morning at Robins Air Force base, day turned to night. Tornado sirens blaring. 80mileperhour winds. In mississippi, the cleanup after several tornadoes touched down. The storms taking a toll on this columbus neighborhood. Trees slamming into mark oswald oh home. Had three on the house right here behind me and one more over here on this side. Reporter in alabama, a swollen creek causing a partial collapse of this road. A van tumbling into the water. The ground soaked overnight in hartselle. Torrential rains and winds damaging homes, taking down trees. To the north, another powerful storm system bringing freezing conditions to michigan. In marquette, a layer of snow and ice. A shift in the polar vortex causing a dip in the jet stream. By sunday morning, windchills will be in the Single Digits and teens. Were also looking at a few bouts of snow sunday and monday with minor accumulations. Reporter tonight a tornado watch continues through georgia and the florida panhandle. Mother nature on a tear and on the move. Miguel almaguer, nbc news. Now to a dire warning from president obama today as he closed out his final Nuclear Security summit. He sounded the alarm about the horrific consequences the world could face if these weapons ended up in the possession of terrorists. Nbcs Andrea Mitchell has late details. Reporter tonight the president s stark warning of the frightening Nuclear Threat facing the world. Isis or other terrorists going nuclear. There is no doubt that if these madmen ever got their hands on a nuclear bomb or Nuclear Material, they most certainly would use it. Reporter the president saying terrorists would need only the smallest amount of plutonium, the size of an apple, to kill or injure hundreds of thousands of people. It would be a humanitarian, political, economic, and environmental catastrophe. Reporter even more likely than a nuclear weapon, isis stealing radio logical material, combining it with an explosive to make a dirty bomb, potentially contaminating an urban area, injuring thousands, costing billions to clean up. But if it went off in downtown new york or some port, say the port of rotterdam or some other crucial asset place, you could have people that would not be able to utilize that place for 10 to 20 years. Reporter just last week, we learned isis bombers in brussels, khalid and ibrahim el bakrao bakraoui, stalked and videotaped a nuclear scientist. Only 23 out of 130 countries have secured the Nuclear Material in their hospitals. Universities and power plants. Asked tonight about donald trump saying it would be okay to let japan and south korea get a bomb, president obama said he doesnt know anything about foreign policy, nuclear policy, or the world generally. Lester. Andrea mitchell, thanks. Now to the clash between the democrats in the 2016 race. The late word that Bernie Sanders now wants an apology after Hillary Clinton angrily accused his campaign of spreading lies during a Testy Exchange with an activist. It comes as hes turning up the heat on clinton in a state she now calls home. Nbcs Kristen Welker has more. Reporter after trying to pivot to the general election, secretary clinton is now refocusing on the battle at hand. Bernie sanders now challenging her on her home turf. If im so fortunate enough to be your president , i will never forget new york. Reporter in syracuse today, clinton courted workingclass voters. My opponent talking about free college. Anytime anybody tells you something is free, ask for the details. Reporter but sanders is surging, drawing a diverse crowd of more than 18,000 people in the bronx last night. If we win here in new york, we are going to make it to the White House Reporter clinton maintains a doubledigit lead in new york, but sanders is catching up and seems poised to win wisconsin, where he stumped today. Clinton feeling the heat, lashing out at an environmental activist yesterday, who accused her of accepting money from the oil and gas industry. I am so sick of the Sanders Campaign lying about me. Im sick of it. Reporter late today, sanders hit back. Secretary clinton owes us an apology. We were not lying. We were telling the truth. Reporter clinton and sanders have both received money from employees of the oil and gas industry. The Political Drama underscoring the high stakes of new york, which could be in play. Democratic primary voters are far to the left of certainly most new yorkers and to the National Democratic party. Reporter new york has 247 pledged delegates up for grabs. If clinton wins here, she could all but put this race away. But a win for sanders could be a gamechanger. Lester. All right. Kristen welker, thanks. Police in new mexico have released harrowing video of a theyrefatal mistake during a botched drug operation. An officer opening fire on someone he believed to be a suspect, only to realize seconds later that man is a fellow cop working undercover. Nbcs Gadi Schwartz has the story. Reporter an undercover sting gone horribly wrong. [ gunfire ] reporter this newly released lapel camera video shows a Police Lieutenant shooting his own undercover officer eight times. That was jacob. Talk to me. Talk to me. Reporter the video captures the moment the lieutenant realizes who he shot. Are you okay . Reporter the officer survived but was hit in almost every major organ. I thought you were a bad guy. The undercover sting over a 60 drug buy. Another lapel camera recording a suspect crawling away. Lapd use of force expert scott reed says this shooting is a case of being unprepared. If you dont train properly, these type of things happen. Reporter the lieutenant had missed the morning briefing, saw a gun in the car, and somehow mistook his officer for the suspect. This week the department announced a 6. 5 million settlement with the officer they shot and announced policy changes in officer training. The chief openly crying during a press conference. My wife and i have become very close to them. Reporter but this latest shooting controversy already came on the heels of a department of justice investigation into the use of force after other highprofile albuquerque shootings. Tonight, yet another Police Apology and another promise for change. Gadi schwartz, nbc news. Millions of americans are set for a pay hike as the biggest state and the biggest city in america announced deals to raise the minimum wage to 15 an hour. Its been a big source of contention in politics. The news comes as we get strong new job numbers. Employers adding 215,000 jobs in march. The Unemployment Rate ticked up slightly to 5 as more americans felt confident enough to jump back into the job market. We get all the latest from nbcs joe fryer. Reporter after threeplus years of protests and strikes, workers behind the fight for 15 movement can now declare victory in two states. I will be able to financially support my son better. Reporter monday, californias governor will sign a bill raising the minimum wage to 15, a measure approved by lawmakers after contentious debate. These are families that are saying, im struggling and no one is listening to me. This bill, my friends, hurts those it pretends to help. Reporter the states current bottom wage, 10, will gradually climb to 15 bucks by 2022. Analysts predict it will impact one out of three california workers. Now new york is following suit. Lawmakers there reached a budget deal that would boost the minimum wage in new york city to 15 by the end of 2018 with slower increases across the rest of the state. But for many businesses, its too much too fast. At the end of the day, the consumer is going to pay for this. Reporter brad rowan owns an Italian Restaurant in california and fears hell have to start raising prices and cutting staff. 15 an hour is a great number. But when youre unemployed because youve been let go because the employer cant afford to keep you, 15 becomes zero. Reporter while more cities and states are lifting their minimum wages, the federal floor of 7. 25 still prevails in 21 states. So for millions, the 15 an hour club remains well out of reach with no clear sign how far this wage wave will spread. Joe fryer, nbc news, los angeles. The fda is making moves over concerns that have been raised for years about the potential health risks for children, including developmental delays from a type of arsenic found in small amounts in infant rice cereal. One of the first foods given to babies. Nbcs Morgan Radford on the warning for parents. Reporter today the food and Drug Administration proposing new limits on a kind of arsenic found in infant rice cereal. What we know is that arsenic can cause neurodevelopmental changes, but thats again at high exposures, at high levels. What we are taking today is a prudent step. Its a way we can reduce exposure to arsenic. Reporter according to the fda, relative to their body weight, babies consume three times more rice than adults, mostly through their cereal, especially when theyre eight months old. But the fda says 53 of rice cereal tests had too much inorganic arsenic, a naturally occurring substance that can cause developmental delays. But there are steps you can take. Rice doesnt have to be the only infant cereal fed. There are many other cereals that are available for parents and caregivers, and we recommend varying the grains for these children. Reporter gerber, one of the leading baby food manufacturers said in a statement, we already meet the level proposed by the fda. Levels adults should be concerned about too. We need to set standards across the board. Were also concerned about the risks to adults as well. Reporter the fda saying rice should be just one part of a wellbalanced diet. Morgan radford, nbc news, new york. Still ahead tonight, sipping and shopping. The trend that experts believe may be driving the rise in latenight online spending sprees. Also late word on what police have concluded about that knife found on o. J. Simpsons former property. Were back now with the surge in what some are calling drunk shopping. More and more people kicking back with some wine or a drink of choice and clicking the buy button at their Favorite Stores online late at night. Nbcs Kristen Dahlgren reports on the rise and how to prevent a big hangover when the bills arrive. Reporter got plans tonight . Dinner . A few cocktails and some clicks . Youre not alone. If the urge to spend clicks in sometime after midnight friday. Online Retailer List says orders are up 48 at 2 00 a. M. Friday over the same time on a monday. Late one night, brittany decided to buy a fitbit. I drank a whole bottle of wine, and then i got a fitbit for my mom, my dad, my sister, and myself. Reporter list says those latenight shoppers spend about 30 more than their school night counterparts. Its all about that stress relief and anxiety. Purchasing something just gives you that happy surge and its certainly something people are looking for at the end of a long work week. Reporter and it seems women are leading the charge. The pieces that people want to shop for when theyre feeling kind of sassy and a little confident is the pieces that make you feel good. Reporter dress sales are up a whopping 320 late friday nights. Lingerie soars 50 . And shoe sales double, especially the expensive ones. So wha can you do to help curb the urge . Experts say always check return policies. Dont save your credit card info online. And set up a separate email for all those offers. For shoppers, the retailers are very aware this is a trend as well, so theyre seeing more targeted ads. Reporter ads that might just make you think you cant live without those shoes. Shirts, skis i didnt need. Reporter Kristen Dahlgren, nbc news, new york. Were back in a moment with the panic on the dock when onlookers realize that the huge ship coming right at them cant stop. Some scary moments captured on camera when a 150foot while watching ship couldnt come to a stop in san diego. Onlookers had to scatter fast when they heard the big boat blast its horn. Seconds later, it rammed right into the pier. At least seven passengers on board were hurt. There are reports the ships propulsion system malfunctioned. A huge debut for a highly anticipated car. A day after video of long lines and crowds that looked more like an apple event, elon musk revealed the tesla model 3 has received 198,000 orders in just 24 hours of launching its more moderately priced electric car. The standard version starts at about 35,000, but the first ones are expected to go for tens of thousands more as customers add more features. Nbc news has learned tonight that forensic tests have ruled out a knife found buried on o. J. Simpsons former property as the murder weapon in simpsons infamous 1994 case. This according to Law Enforcement sources familiar with the investigation. The knife made headlines weeks ago when its existence was revealed. A construction worker reportedly found it and turned it over to a police officer, who held on to it for years. When we come back, our friday making a difference. A crowded school where they keep fighting room in their hearts and classrooms for kids with nowhere else to go. Aj m 1 ana le lk aat parwhe finally tonight, a story about a school that has a lot more compassion than it does space. There arent enough seats for all the girls who want to learn there. But rather than turn them away, this school found a Pretty Simple solution. Kelly cobiella explains in tonights making a difference report. Reporter at this school for girls in jordan, behind the smiles, trauma and loss. These are little girls who fled war in syria, now in a foreign land learning english. The principal says it was crowded before the refugees started showing up. The school is full, but they beg, and even some of them wept. Reporter so the principal came up with a simple answer. If you want a place in school, bring a chair. Just a chair. Reporter and they did. Not just one girl, but one after another after another. Today one in five girls here is syrian. I want to be smart, she says. When she came here with her mother, her mother told me that please, i want her just to write her name. Reporter hana says she was afraid of school, even afraid to leave her mother. Now she and nalad are two of the best students. The school has made them feel they belong, and that gives their parents hope. Theyre looking to be a part of something for their children, to be a part of a community. And the principal cant say no. Reporter joe biden even cheering her on. Principal maha always finds room for just one more. Maybe some of them doctors, some of them engineers, some of them teachers. I will be very, very happy if i teach. Reporter it starts with a chair. Kelly cobiella, nbc news, amman, jordan. And a big heart. Thats going to do it for us on this friday night. Im lester holt. For all of us at nbc news, thank you for watching. Have a great weekend and good night. Angr ouue. Ve any tr