Bill Cooke of NASA's Meteoroid Environmental Office said the widely-reported flash in the sky was probably "a single meteor event." He told the Associated Press:
[It] looks to be a fireball that moved roughly toward the South East, going on visual reports.
Judging from the brightness, we're dealing with something as bright as the full moon.
The thing is probably a yard across. We basically have [had] a boulder enter the atmosphere over the North East.
More top news
The bus was travelling to Baton Rouge on Sunday morning to deliver flood relief aid when the crash happened.
The man escaped from a guard and jumped over a third floor balcony of a courthouse in Steubenville, Ohio, on Friday.
The X Factor made an emotional return on Sunday night as a returning contestant and a single mother were both given second chances.