Live bullet found aboard United flight forces passengers off plane for security sweep at Denver airport

A United Airlines flight from Denver to San Diego was delayed Thursday after a live bullet was discovered aboard the plane before departure, prompting passengers to deplane while security personnel swept the aircraft.

United Flight 1302 was preparing to leave Denver International Airport when the bullet was found during routine checks before the plane taxied to the runway, according to FOX31 Denver, which had a member of its news team aboard the flight.

"The bad news is we found a live round, a bullet on the airplane," the speaker said. "This is a security breach here, and everybody is going to have to deplane."

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Passengers were instructed to leave the Boeing 737-900 with their carry-on bags while security personnel searched the aircraft.

"We...