A person has been detained after a reported bomb threat involving a Frontier Airlines flight at George Bush Intercontinental Airport on Thursday, according to officials.
A package that officials said contained two vials of a "homemade explosive substance" was discovered near the Arizona State Capitol in downtown Phoenix on Monday.
Four alleged members of an extremist group are suspected of planning bomb attacks on New Year's Eve across Southern California.
The League City Police Department says it's investigating multiple hoax bomb threat calls made to businesses around the area.
Homeland Security said investigators arrested an Afghan national who allegedly made a social media post about "building a bomb" and threatened to blow up a building in Fort Worth, Texas.
Passengers on a Frontier Airlines flight faced a frightening morning after a bomb threat note was found on board, forcing everyone to remain on the tarmac for hours.