Marine helicopter crashes in California, 4 presumably dead

Marine Corps helicopter crashed on Tuesday in Southern California, leaving four presumably dead. 

The helicopter, CH-53E Super Stallion helicopter, crashed during a routine training mission when the 3rd Marine Aircraft Wing went down.

The cause of the crash is under investigation.

The four crew members' identities have not been released yet pending 24 hours after notifying their families.

The name of the crew's squadron and the base from which it flew were also withheld by the Marine officials.

The CH-53E is largest and heaviest helicopter in the US military.