U.S. fire and rescue crews responded to the crash of an HH-60 helicopter Monday near Camp Hansen in Okinawa, Japan, the U.S. Air Force said. The status of at least four people on board the helicopter, based at Kadena Air Base in Japan, wasn\'t immediately known, the Air Force said in a statement. However, Kyodo reported three of the four crew members were confirmed safe. The news service said Japanese officials had no other information about the crash. Officials said the helicopter was conducting a local training mission when it crashed. The matter was under investigation, the Air Force said.