The gun of a US Airways pilot went off in the plane’s cockpit during a flight, the Transportation Safety Administration confirmed.

There were no injuries on Flight 1536 from Denver to Charlotte, N.C., according to authorities. Airline and federal officials said that no one was endangered by the accident. The pilot’s gun went off at about 9:50 a.m. MDT on Saturday.

The pilot’s identity wasn’t released.

Pilots are allowed to carry weapons with them as part of the Transportation Security Administration's Federal Flight Deck Officer program introduced after the Sept. 11th terrorist attacks. According to the program, eligible crew members such as pilots, navigators and flight engineers are allowed to carry and use a gun during the flights. They are allowed to use the weapon, usually an H&K 40-caliber semiautomatic to counter any act of air piracy or criminal violence.

"Federal flight deck officers are authorized and trained to carry their firearms on their person inside the flight deck of an aircraft," said a TSA spokesperson.

The pilot landed the Airbus A319 with 124 passengers on board safely. The plane has been taken out of service pending an investigation.

According to the TSA, the passenger didn’t hear the gunshot so they were unaware of what happened in the cock pit.

Details about the position of the gun when it went off are still unknown. The investigation continues. The agency also wouldn’t say what the bullet struck.  

"There are thousands of federal flight deck officers and this has never happened before," said a spokesperson for the TSA. "This was probably a bit of a fluke."