Update: Arrest made.
Transit Police report they are looking for a man they say used a "blunt object" to attack a woman in the commuter-rail section of North Station around 10:25 p.m. yesterday.
Police say the man attacked the woman "without provocation." WCVB reports she was smashed in the face.
If he looks familiar, contact detectives at 617-222-1050 or text an anonymous tip to 873873.