A senior administration official told reporters during a conference call tonight that during the raid by U.S. forces that killed Osama bin Laden “we lost one helicopter due to mechanical failure.” But all U.S. forces escaped safely. “The aircraft was destroyed by the crew and the assault force and crew members boarded the remaining aircraft to exit the compound,” the senior administration official said. “All non-combatants were moved safely away from the compound before the detonation.”

The Washington Examiner‘s Philip Klein has more details from the conference call: