(CNN) -- 4 Army aviators are dead after a crash involving two army helicopters.
It happened just after 8 o'clock Monday night at Washington's joint base Lewis-McChord.
The accident involving 2 helicopters happened inside the southwest training area at JBLM.
The names of the dead have not been released pending notification of next of kin plus 24 hours, in accordance with Defense Department policy.
An investigation into the cause of the accident has already begun by local authorities.
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