BOSTON (AP) - Federal investigators say the crew of a jet that crashed in Massachusetts last year, killing a Philadelphia newspaper co-owner and six others, did not perform a pre-flight check and failed to disengage a safety mechanism before takeoff.

BOSTON (AP) Federal investigators say the crew of a jet that crashed in Massachusetts last year, killing a Philadelphia newspaper co-owner and six others, did not perform a pre-flight check and failed to disengage a safety mechanism before takeoff.

The National Transportation Safety Board announced the results Wednesday of the investigation into the May 2014 crash in Bedford. Philadelphia Inquirer co-owner Lewis Katz was among those killed.

The Gulfstream G-IV business jet overran the runway, crashed into a ravine and caught fire.

Investigators said the crew engaged a device that prevents the aircraft control system from moving when the jet is parked, but did not disengage it before takeoff. The device was meant to prevent the throttle from being moved more than 6 degrees, but it was moved almost four times that.