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SILT, Colo.—National Transportation Safety Board and FAA officials are expected to arrive Tuesday to investigate after a helicopter crashed near Silt in western Colorado, killing all three people aboard.

Authorities say the three men were killed Monday morning during a routine aerial inspection of power lines when the helicopter snagged a line and crashed.

Garfield County Sheriff Lou Vallario tells the Glenwood Springs Post Independent that Doug Sheffer, the owner and chief pilot for DBS Helicopters, based in Rifle, was among those killed. The names of the other two on board have not been released.