A Frontier Airlines flight at Denver International Airport was quickly evacuated Sunday night after a gun magazine was found in the aircraft.

Frontier Flight 4765, which was scheduled to travel from Denver to Phoenix, was promptly evacuated after the discovery, Frontier said in a statement Monday.

Passengers were rescreened, and a security sweep of the aircraft was conducted. There were no reports of injuries.

“Given the delay, the flight crew exceeded their duty time and thus customers were booked on a new flight for early this morning,” Frontier said.

The flight was rescheduled and left at 6 a.m. MT Monday. It arrived in Phoenix Sky Harbor International Airport at 6:50 a.m.

It is unclear where or how the gun magazine was discovered or whether a passenger physically had the magazine.

Another Frontier plane was evacuated Friday after it struck a person on a Denver International Airport runway.

Around 11 p.m. Friday, the Frontier flight was preparing to travel to Los Angeles International Airport before it hit a trespasser.

The jet, carrying roughly 231 people, filled with smoke after the collision. Everyone was evacuated on inflatable slides.

The person who died has not been identified.