A U.S. Navy SEAL was killed and another was injured in a training accident in Arizona, a U.S. Department of Defense official said Friday.

The SEAL who was killed belonged to SEAL Team Six, the elite squad from which a team was selected to go after Osama bin Laden in Pakistan two years ago, a source said.

The accident occurred Thursday at a U.S. Special Operations Command parachute testing and training facility at Pinal Airpark, Arizona.

The SEALs were transported to the University of Arizona Medical Center, where one remains hospitalized, the official said.

The accident is under investigation, the official said.