Transit Police arrested a registered sex offender for performing a lewd act on an MBTA Green Line train on Thursday night.
According to police, officers responded to the Coolidge Corner station, where a female witness told officers the man was conducting himself in a lewd manner.
She moved away to another seat in the trolley and contacted police.
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The suspect, later identified as Robert Widberg, 53, of Canton, Massachusetts, was arrested and charged with open and gross lewdness.
During the investigation officers learned Widberg was a registered level 2 sex offender.
It's not if Widberg has an attorney.