At least four people are dead after a civilian contracted helicopter crashed in Hawaii on Tuesday near the Pacific Missile Range Facility (PMRF) in Kauai County, according to the U.S. military.
A PMRF statement said emergency personnel at the facility responded to the crash just after 10 a.m., near the north area of the Barking Sands installation. The helicopter was flying in support of a range training operation. There were no survivors.
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In a news release, the facility said the helicopter was flown by Croman Corp., which describes itself as one of the world's most experienced operators of Sikorsky S-61 helicopters.
The National Transportation Safety Board (NTSB) said the agency was investigating the crash of a Sikorsky S-61N helicopter, the Associated Press reported.
Pacific Missile Range Facility Barking Sands, a U.S. naval facility, is the world's largest instrumented, "multi-dimensional" testing and training missile range, according to the U.S. Navy.
"PMRF is the only range in the world where submarines, surface ships, aircraft, and space vehicles can operate and be tracked simultaneously," the Navy added.
Kauai police were assisting the Navy with perimeter security and investigation support, said Coco Zickos, a county spokesperson.
An investigation is set to be underway to determine the cause of the crash.
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The crash occurred after two Black Hawk helicopters were involved in a training accident in Utah on Tuesday.
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No crew members were injured during that training accident, according to the Utah National Guard.
This is a developing story. Check back for updates.
The Associated Press contributed to this report