Five killed in Alaska helicopter crash

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A helicopter has crashed in Alaska killing five people and leaving one in serious but stable condition, authorities say.

The Eurocopter AS50 crashed under unknown circumstances near Butte at 6.35pm on Saturday, the Federal Aviation Administration said on Sunday.

Alaska State Troopers said in a statement on Sunday they received a report of an overdue helicopter and the location of possible crash debris on Saturday night.

A rescue team from Alaska Rescue Coordination Center was dispatched to the crash site in the area of Knik Glacier just after 10pm, troopers wrote.

The team arrived to find five occupants dead and a sole survivor who was taken to a hospital.

No identities were immediately released, but authorities are notifying next of kin.

The Alaska State Troopers, Alaska Army National Guard, and Alaska Mountain Rescue Group will attempt recovery efforts at the site on Sunday.

The National Transportation Safety Board said an investigator was headed to the crash scene.