MANSFIELD, Mass. (AP) – An Acela Express train struck and killed one person, believed to be a teenager, in Mansfield on Sunday, officials said.

There were no immediate details on the victim’s age or the circumstances, said Marc Magliari, a spokesman for Amtrak, which operates the high-speed Acela Express.

The 1:30 p.m. accident occurred shortly before the train reached the MBTA station in Mansfield, where it typically rolls past. The train departed Boston’s South Station at 1:10 p.m., with scheduled stops in New York, Philadelphia and Washington, D.C.

Magliari said 160 passengers and crew reported no injuries aboard the train.

After a nearly four-hour delay, passengers were transferred to a different southbound train, said passenger Monica Costello, a journalist.

“The train just slammed on the brakes,” Costello said. “It wasn’t totally uncomfortable, but it was unusual. The first announcement was ‘we have hit some debris.’ But then, there was just a whole lot of panic going on and we were told immediately it would be two-three hours (delayed) and I felt right away that doesn’t sound right.”

Magliari would not comment on reports from passengers that a second person saw the crash. Mansfield police and fire officials would not comment.