Cambridge Police have released surveillance video and photos of a man they say entered St. Sava Serbian Orthodox Church around 3:15 a.m. on Sept. 29, "initially put on priest clothing, later de-clothed and then committed a lewd act on the altar of the church."

Police say the man, in his 20s, entered through an unlocked door, but was captured on video by a new surveillance system the church had just had installed.

If he seems familiar, contact Cambridge Police at 617-349-9390.