Kaleidosco kaleidoscope colors, American Cities incredible celebration of spring. Nightly news begins now. Announcer from nbc news World Headquarters in new york, this is nbc nightly news with lester holt. Good evening. A massive cyber extortion attack is underway in at least 70 countries tonight holding Computer Data hostage for ransom. The department of Homeland Security is warning American Companies to be on guard as the attack sweeps across europe including british hospitals where frozen computer screens forced staff to turn away some patients. We get late details from london and nbcs kelly ko kelly. Reporter Companies Held for ransom. A computer virus paralyzing Britains Health services, healthcare reform rocl ambulances diverted and routine surgeries cancelled. We turned up for an appointment to have his foot checked, and they said im really sorry, but the Computer System is down. You have to go away. Reporter the virus locked computers. On screen a message demanding 300 in bit coin to get access. This was not targeted at nhs. Its an international attack. Reporter the attack reportedly affecting Computer Networks in at least 70 countries. Russia hit the worst. Even spreading through that countrys interior ministry. Security experts say the virus exploits holes in Software Security first identified by the National Security agency and leaked by hackers. Its called wanna decryptor or wanna cry. The goal, not patient files or data, just money. Last year, a hospital in l. A. Paid 17,000 to unlock their files. In january, a Hotel Austria was hit. If you keep your security up to date, if you make regular backups of important data, you can recover from an instance like this. Many dont. Reporter the message to britains hospitals, pay up by may 19th or their data will disappear. Its not yet clear who is behind the attack but tonight chs is putting out that alert to u. S. Companies, a microsoft spokesperson said to guard against the virus, simply make sure your computers are updated and running their latest software. Lester . Kelly, thank you. There is new fallout tonight from our exclusive be interview with President Trump that unleashed a morning tirade on twitter, to some looked more like a threat to the fbi director telling james comey he better hope there are no tapes of the conversations and the white house is not confirming or denying that the president has a secret recording Kristen Welker has details. Reporter President Trump all smiles at this mothers Day Celebration with the first lady but lashing out in a tweet storm unleashing a warning. James comey better hope there are no tapes of our conversations before he starts leaking to the press. Mr. Trump described a january 27th dinner with comey during an interview with lester. We had a very nice dinner and he told me youre not under investigation. Reporter that is in dispute and so is the president taping discussions. Today mr. Trump didnt deny it. I wont talk about that. All i want is for comey to be honest. Reporter a similar dodge from the press secretary. Are there recording devices in the residence . There is nothing further to add. There is no example of any modern white house recording any conversations unless you go back to the dark sinister time of nixon. Reporter the white house is trying to explain what led to y initially blaming the clinton investigation, the president now admitting. I said, you know, this russia thing with trump and russia is a made up story. Its an execution by the democrats for having lost an election they should have won. Reporter a very different explanation than the ones given initially. Because of the actions the Department Attorney general outlined. Reporter increasingly on defense over the mixed messages, mr. Trump tweeting today hes an active president. It is not possible for my surrogates to stand at podium with perfect accuracy and the president pushed back of business ties with russia making public a letter from his attorneys sent to congress that states a review of the last ten years of tax returns do not reflect any income from russian sources with some exceptions, including the 2013 Miss Universe pageant held in moscow. Still, frustrated members of congress urging comey to id like to know if the president ordered mr. Comey to end the investigation. Reporter comey was invited to testify before the Senate Intelligence committee on tuesday. Hes not available then but lawmakers are working with him to find another time. Also tonight, the president threatening to cancel the daily press briefings, but no final decision yet. Lester. Kristen welker at the white house for us tonight. In the meantime, friends of james comey are pushing back from the dinner the two had first described in our interview but still no comment from comey himself. Pete williams has that end of the story. Reporter one week after the inauguration, President Trump had dinner at the white house with fbi director james comey. The president told lester holt the meeting was comeys idea. I had a dinner with him. He wanted to have dinner because he wanted to stay on. He asked for the dinner . The dinner was the dinner, and he wanted to stay on as the fbi head, and i said ill consider. Well see what happens. Reporter but today the former director of National Intelligence told nbcs Andrea Mitchell on the morning of the dinner, comey said it wasnt his idea. He mentioned he was invited to the white house to have dinner with the president and he was uneasy with that because of even compromising even the optics, the appearance of independents, not only him but the fbi. Reporter several that knew comey say they heard from him shortly after the dinner and he told them back then during the dinner mr. Trump asked a couple times if he would be loyal to the president and comey said he couldnt promise that but he could promise he would always be honest. Mr. Trump told fox news today he never asked about it. Did you ask that question . No, no, i didnt but i dont think it would be a bad question to ask. Comey better hope there are no tapes of the conversation, friends of comey say they are sure he would be delighted if it was recorded since the two accounts of what happened are so different. Friends of comey say the white house invitation came the day before or the day of the dinner. The same time as the Justice Department was warning that michael flynn, then the National Security advisor lied to the Vice President about contact with the russian ambassador. Lester . Pete williams in washington, thank you. In firing comey, the president said he agreed with the Justice Department assessment that comeys public statements about the clinton email investigation violated Justice Department principles. As a candidate, donald trump supported comeys reopening of the case and in my interview with the president yesterday, he appeared to be more concerned that comey declined to charge mrs. Clinton then he was about any broken rules. Would you justify he shouldnt be doing that or the investigation didnt lead into an indictment. When i was a candidate, a lot different than being president but when i was a candidate, what he did, what comey did had good moments for me. Im only talking as a candidate where i want to do what is right for the country, im talking purely as a candidate. When he came out with the scathing set of circumstances, the server, the illegal server. The emails, 33,000 emails you get subpoenaed and dont show and acid wash them. When he did all of that stuff, it was disgraceful when hes covering everything point after point. I was with lawyers watching that. They were extremely careless in their sensitive highly classified information. I happen to have lawyers, unrelated lawyers and they would say wow, shes guilty here, guilty. Guilty. Guilty. Then he gets to the end and he says shes free as a bird. Although the department of justice makes final decisions on matters like this, we are expressing to justice our view that no charges are appropriate in this case. So you didnt like the outcome . No, what happened, he had a lot of pressure and exonerated her. He should have never exonerated here. The president called comeys recent explanation of the decisions in the clinton case horrible. Well turn to ohio where a gunman today opened fire at a nursing home outside columbus killing a police chief and two employees. Chief steven eric had a baby and only been at the job for three weeks. The suspected gunman was found at the scene. Police have not identified him or revealed the motive. Another story out of ohio, a heartbreaking one concerning an 8yearold boy that after an alleged bullying incident at school. Today School Officials released the video of that incident after the boys mother claimed the school wasnt being straight with her about what happened. Nbcs blake mccoy has more. Reporter its been nearly four months since Cornelia Reynolds discovered the unthinkable, her 8yearold son dead in his bedroom. Gabriel had hanged himself from his bunk bed. He probably didnt want to say mom, somebody bullying or picking on me, you know. He just didnt know how to tell me. Reporter reynolds spoke with wlwt days after gabriels death and says she was never told her third grader was being bullied but tonight this video shows an alleged assault in a School Bathroom where gabriel is knocked unconscious two days before he ended his life. The School District never told mom that there was a video. They never told mom he had been assaulted. Reporter family attorneys were given the video after they asked questions. The School District denies any wrongdoing saying in part throw the connection between this incident at school and gabriels suicide are not clear, the district shared this video with Police Investigators at the time of the incident. Their investigation has concluded and no charges were filed. They say a school nurse checked gabriels vitals at the time, which were normal and called his mom. She says she was only told her son had fainted. They busted my babys lip. They busted his nose, and im sorry. Reporter this new video is prompting the coroner to reopen the Death Investigation as gabriels mother wonders what could have been done if she had only known. Blake mccoy, nbc news. Sweeping changes are coming to the drug policy in this country after the attorney general announced a tough crack down. Jeff sessions ordering federal prosecutors to charge drug offenders are the most serious crimes they can carrying the maximum punishments, reversing an obama era push for more leniency for nonviolent offenders. Nbcs Hallie Jackson has details for us. Reporter when norman brown was 22 he received a mandatory sentence for distributing crack cocaine. I do deserve to serve some time, but that much . I think that was over kill. Reporter after 24 years, his sentence was commuted by then president obama in 2015 as part of his push to rollback what he described as excessive penalties for nonviolent, lower level offenders. Their punishments didnt fit the crime. Reporter today a significant shift back to stricter guidelines. This is a key part of President Trumps promise to keep america safe. If you are a drug trafficker, we will not look the other way. Reporter attorney general jeff session is ordering prosecutors to go after the toughest possible sentences including those with mandatory minimums allowing for certain exceptions if approved by a u. S. Attorney or assistant attorney policies that gave more leeway to prosecutors. What well probably be seeing is increasing prison populations in a federal system. Reporter Civil Liberties advocates argue the decision will repeat a failed experiment with former a. G. Eric holder that implemented the policy calling the new one not tough on crime but dumb on crime quote an ideologically motivated cookie cutter approach. Norman brown hopes the new attorney general will change his mind. There are more people like me dying in prison that need to get out and give back. Reporter Hallie Jackson, nbc news, the white house. Still ahead here tonight, no laptops allowed. Homeland security considering a massive expansion of its ban on Electronic Devices larger than a cell phone to hundreds more flights. Well tell you when it could go into effect. Also, a scandal for one of the nations largest banks may be bigger than previously thought. Well be right back. Is scary. I say not if you protect yourself. Y . Pneumococcal pneumonia. Its a serious disease. My doctor said the risk is greater now that im over 50 yeah. Yaha. Just one dose of the prevnar 13® vaccine can help protect you from Pneumococcal Pneumonia an illness that can cause coughing, chest pain, difficulty breathing, and may even put you in the hospital. Prevnar 13® is approved for adults 18 and older to help prevent infections from 13 strains of the bacteria that cause Pneumococcal Pneumonia. You should not receive prevnar 13® if you have had a severe allergic reaction to the vaccine or its ingredients. If you have a weakened immune system, you may have a lower response to the vaccine. 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With Liberty Mutual new car replacement™, well replace the full value of your car. Liberty stands with you™. Liberty mutual insurance. Were back now with potentially big news in the air. U. S. Homeland security is considering a ban on electronics on passenger aircraft traveling transatlantic entering the u. S. From europe. Nothing bigger than a cell phone would be allowed on board and expansion involving flights from the middle east amid fears of explosives. Tom costello has details. Reporter the order would prohibit passengers from bringing any Electronic Device larger than a cell phone leaving europe to the u. S. Laptops, gaming devices, dvd players. Terrorists have found a way to conceal explosives in personal electronics. What we might see is this ban go for quite awhile until either the threat goes away, which i dont see that happening any time soon, or all these countries start upgrading the screening technology. Reporter and checked luggage goes through more thorough explosive screening than carry on bags. Already u. S. Airlines are told to prepare. Today delta prematurely posted a notice in cincinnati. A Similar Electronics ban has been in place since march affecting flights from ten airports in the middle east and north africa. Roughly 50 flights a day but expanding the ban to flights from europe would affect many more flights. 142,000 passengers each day arrive from the eight busiest european countries. Major disruption for business travelers. Nothing, i would say my laptop would affect me because i like to do my work on longhaul flights. You need entertainment, something to keep you busy. Reporter another serious concern, the fire risk from loading so many Electronic Devices with lithium ion batteries into the bottom. The ban could be announced in two weeks. While some travelers may be upset, security sources say the prime objective is the safety of the aircraft. 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