"The cause of the crash is established", - stated in the message channel on Twitter.
The Naval Safety Center had recorded 23 air fatalities involving Navy and Marine Corps crews over the previous 12 months before Tuesday's crash. The names of the dead were withheld pending notification of their families, which typically takes about 24 hours.
The four crew members aboard a U.S. Marine Corps helicopter that crashed in Southern California on Tuesday are presumed dead, authorities said. "The 3rd Marine Aircraft Wing Communications Strategy and Operations Unit will provide more information about the incident as it becomes available".
The helicopter was assigned to the 3rd Marine Aircraft Wing out of the Miramar air station in San Diego.
"We ask that you continue to be patient with us as the situation unfolds". The aircraft can carry massive loads, according to the Marine Corps, including a 26,000-pound light armored vehicle, 16 tons of cargo or a force of combat-loaded Marines to lead an assault.
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Tuesday's helicopter incident is not the first over U.S. territory this year.
A CH-53E Super Stallion, used mainly for heavy lifting of military equipment, comes down near El Centro, close to Mexico's border. The Marines ultimately ruled that crash was the result of pilot error, leading two of the massive aircraft to collide in the air.
This is not the first time a CH-53E was involved in a deadly crash.
No personnel on the ground were injured and there was no damage to the airport's infrastructure.