Police release images of suspect in Monday's groping attacks in Allston

Boston Police have released three surveillance photos of a suspect for at least one of Monday's sexual attacks, in which a man lifted women's skirts, then groped them.

The photos, taken by a camera inside a Green Line trolley, show a slim, balding white man in his late 30s or early 40, slim build, thin hair balding, wearing a blue T-shirt and gray cargo shorts, matching the description given by the two women.

Police did not say if the man is also a suspect in similar attacks on Sunday on Gardner Street.