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frustrated after more airline chaos. the faa grounded all u.s. flights for about 90 minutes because of an outage of a system that sends critical safety messages to pilots. >> there are now more than 1,200 cancellations, 7900 flight delays. it's been less than two weeks since southwest's meltdown. flights have been gradually taking off. at this hour, it's not known what caused the system's failure according to transportation secretary pete buttigieg. he says there's no sign it was terror related. >> there was an issue with irre irregularities with the messages. we have to figure out w...

according to ukrainian armed forces. civilians have also been targeted. this video showing the terrifying a blast rocks a pedestrian bridge in kyiv moments before a person could be seen walking across it. that person manages to turn back and runway from the destruction. that strike reminiscent of this blast saturday on a crucial bridge connecting russian-controlled crimea and the country's mainland. a blow to russia suffering humiliating defeats on the battlefield. vladimir putin says that today's wave of violence is revenge for that blast. he blames ukraine, even though kyiv has not...

women. how did it happen? and the mission to rescue tourists stranded in the grand canyon caverns randed 200 feet underground. >> announcer: this is "nbc nightly news" with lester holt good evening we will never know exactly how much higher the death toll would have been in yesterday's school shooting in st. louis had police not killed the attacker but today there is chilling new evidence the 19-year-old killer intended it to ba bloodbath. today, police revealing the gunman used an ar 15 style rifle to shoot his victims. a teacher and a student were both killed four others wounde...

good afternoon, everyone. i'm bianna golodryga. welcome to "cnn newsroom." >> i'm victor blackwell. it's good to have you. more than 9 million votes across the country already been cast. election day just two weeks away now. not two days away. two weeks away. and the pressure's on for the candidates to win over every voter. it's especially high in pennsylvania. tonight democrat john fetterman will face off against republican mehmet oz in perhaps the most anticipated debate of the election season. >> it's also the only chance for pennsylvanians to see the candidates argue the issues s...

border. >> criminal back behind bars after pushing a man off a subway platform. the family calling him a menace being arrested two dozen times. >> no cash bail created a real problem. >> people are frightened. >> blitz, throws herbert. blocking, and the touchdown. ♪ ♪ ♪ >> ainsley: that's great song. never heard that one before. did you all see who sings that? >> brian: i like it. flo rida. >> ainsley: beautiful shot of pittsburgh. beautiful day a low of 48. it is the steel city. 300 steel related businesses there. it's the city of bridges. >> steve: that's why they call them t...