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how a mega-drought is transforming the grand canyon and the groom stranded on his wedding day and the police boat that saved the day. >> announcer: this is “nbc nightly news" with lester holt good evening a disturbing warning tonight apparently tied to the fbi's search of former president donald trump's home last week fbi and homeland security advising agents in a joint intelligence bulletin of an increase in threats to federal law enforcement, identifying threats coming online, some reportedly with personal information of possible targets attached, addresses, family members at...

states to delve into more specific gun legislation that they thought was necessary. obviously what is going to work in california and what is going to pass in texas two very different outcomes there. but very significant that you had cornyn talking about this yesterday, in texas, that lawmakers are going to be having these discussions. and i'm told the goal and hope is that they might be able to have some framework when they return from their recess. now, that's not very much time, but as you know, time can really be an enemy if you don't come up with some kind of solution in the int...

elementary school. she saw her teacher killed. for the first time we learn what the killer said before he fired his gun in that classroom. we hear new details about what he did, this witness says he played music during the massacre. and we learn what this brave 11-year-old did to stay alive while it was all happening. all of this at the top of the next hour. in the meantime, the police response to the tragedy that took place here is facing intense scrutiny and there are new questions about the timeline. this is what we know. the 18-year-old gunman was not -- not -- confronted by la...

camera. she did agree to speak with my partner cnn producer nora. you were in with mia and her mother, i want to make clear her mother was there the whole time. what did she tell you? >> the 11-year-old mia was in that fourth grade classroom that we have heard so much about with ms. garcia and ms. morales. they were watching lilo and stitch, it was the end of the school year, and she said one of her teachers got the email that there was a shooter in the building and went to the door and he was right there. they made eye contact. >> the shooter made eye contact with the teacher. >> wi...

america's fentanyl crisis. we go inside a d.e.a. lab with the head of the agency to find out where the deadly synthetic drug comes from and how easy it is for teens to buy pills. you're saying that teens can get these drugs just as easy as they can order something through uber eats? >> there's no question. >> o'donnell: american innovation. how u.v. light could protect against the next pandemic. and finally, a world war ii veteran lost to history finally getting a hero's good-bye. ♪ ♪ ♪ this is the "cbs evening news" with norah o'donnell, reporting from the nation's capital. â™...