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CORNING, N.Y. -- Federal investigators have confirmed that this month's deadly helicopter crash in Corning was the result of the chopper getting caught up in power lines.

The preliminary report from the National Transportation Safety Board shows that a power line became wrapped around the tail rotor assembly and caused it to separate from the craft.

The helicopter crashed beside the Chemung River on November 15th. It was being used by NYSEG at the time to inspect power lines after a storm.

Both the pilot, who was a contracted employee from Oregon, and NYSEG employee Dale Crout were killed in the crash.

The NTSB says that the chopper had refueled at the Elmira-Corning Regional Airport just minutes before the crash.