A woman in her 30s was struck and killed by a northbound Orange Line train at Stony Brook Station in Jamaica Plain this afternoon, authorities said.

The woman was trespassing on the inbound track toward the south end of the station when she was struck, MBTA Transit Police said in a statement, citing preliminary reports from officers on the scene.

Transit Police responded to the scene at about 2:45 p.m., along with Boston police, fire, and rescue workers, the statement said.

Transit Police are investigating the incident, the agency said.

Shuttle buses have replaced train service between Ruggles Station and Forest Hills Station, according to the MBTA.