An unregistered sex offender was arrested after police say he committed a lewd act and assaulted an officer at an MBTA station ... nabbed at the Maverick Square Blue Line station in Boston around ...

2/28 6pm a 56y/o well known to TPD for committing sexual offences arrested at #MBTA Maverick Sq. Station for Open & Gross Lewdness, A & B on Police Officer & Failure to Register as a Sex Offender.