A person was struck and killed by a commuter rail train in Medford Thursday, according to MBTA Transit Police.

Around 7 p.m., transit police received a call about a possible person struck by a Lowell Line MBTA commuter rail train near Ball Square. Transit police and the Medford Fire Department responding to the scene confirmed that a male, age unknown, was hit while trespassing on the inbound track.

Transit police detectives and the Middlesex District Attorney’s office are currently investigating the incident.