Chris Tonight News Today : Breaking News, Live Updates & Top Stories | Vimarsana

Would kill his family. >> this is a long story, my son was in a boat wreck months back. he has been getting threats. most of it has been benign stuff. we didn't take serious. he's been getting like punched. i know that that is what it is. >> reporter: a key moment in the body cam footage comes when sergeant green asks when he last saw his family. listen closely to his answer. >> when was the last time you were here with them or talked to them or anything like that? >> um -- it was earlier tonight. i don't know the exact time. >> okay. >> but i left, i was gone probably an hour and a half from ...

Incident in u.s. aviation. united triple 7 dive wiing towa the ocean. >> felt like a roller coaster republican. >> reporter: rod williams was traveling home with his family. >> you count your blessings, ask if this is the last time that you will see your family. >> reporter: and the flight take takes off, and then falls for 21 seconds reaching just 775 feet before sea level before abruptly leveling out and rapidly ascending once again. the plane which can carry more than 300 passengers was mostly full doaccording to williams. >> pilots simply said ladies and gentlemen, you probably felt a coup...

Investigation, the pilots who have a combined 25,000 hours of flight time received additional training, but neither the faa nor united will say why the pilots ended up in a dive telling cnn the safety investigations are confidential. >> they will be corrected to prevent it from happening again which indicates to me that something occurred had could have been prevented by the crew. >> reporter: a retired 777 captain from a major airline. what might have happened here? >> numerous things that could have happened had would cause a distraction. and they may have unintentionally lost controlhad dis...

Listen in. >> you never think that it will happen until it actually happens. you think that you are safe. we all thought that we were safe on the second floor in the cafeteria, but obviously we weren't. we were told to evacuate and we all ran out. it was terrifying. pretty scary. >> reporter: and terrifying indeed. again investigators saying the threat is no longer walking around on this campus. authorities telling us that 43-year-old ended his life. and investigators also saying that they don't know a motive. they say that the 43-year-old had no ties to michigan state university. but as a pro...

And the united states denies flying surveillance balloons over china despite accusations from beijing. chinese claim that the u.s. has illegally flown at least 10 surveillance balloons over china the last 13 months,en a allegation shot down by the state department. >> there are no u.s. government balloons. none, period. >> let's go live to steven jiang. >> reporter: and the chinese are doubling down on their claim and saying that it is the u.s. that needs to investigate this allegation and give them a proper answer. but again, without presenting any concrete proof. when asked about evidence, t...