US European Command stated that search and rescue operations were launched immediately following the crash, and an investigation into its cause is underway. Five United States servicepeople were killed when a military helicopter crashed over the eastern Mediterranean Sea during a training mission, US officials said. The military’s European Command said on Sunday that all five crew members on board were killed when the aircraft went down “during a routine air refueling mission as part of military training.”The military first announced the crash on Saturday and said that the cause is under investigation, but there are no indications of any hostile activity involved. European Command said that out of respect for the families of the service members and in line with Department of Defense policy, the identities of the crew members are being withheld for 24 hours until the families of those killed have been notified. It wasn’t immediately clear which military service the aircraft belonged to.