BEDFORD, Mass. (AP) — A small private plane with seven people aboard crashed and caught fire Saturday night as it was leaving Hanscom Field in Massachusetts, authorities said.

Details on the condition of the seven aboard the Gulfstream IV aircraft were not available as emergency personnel continued to work the scene overnight.

"Their conditions at this time are unknown," said Matthew Brelis, a spokesman for the Massachusetts Port Authority, which operates the air field in Bedford. "Our thoughts and prayers are with the people on board and their loved ones."

The plane was headed to Atlantic City International Airport in New Jersey when it apparently went off the runway and crashed at 9:40 p.m. then caught fire, authorities said.

The air field, which serves the public, was closed.

The National Transportation Safety Board is investigating and will determine the cause of the accident, said Jim Peters, a spokesman for the Federal Aviation Administration.