Somerville police officers were dispatched to the Prospect Hill Monument last week on reports that an attempted break-in was underway there.
An anonymous caller had said that a man in black shorts and no shirt was attempting to break into the tower using some sort of tool.
Upon arrival the responding officers cautiously climbed the stairs, looking for signs of the reported intruder. A male matching the description given was discovered kneeling over the lock to the door of the tower in what appeared to be an active attempt at picking it, police said.
When ordered to stop the man reportedly attempted to flee but was stopped by the police officers. According to police, the man was found to be in possession of a lock pick gun and three lock picks.
Alexander Ezorsky-Lie, 24, of Cambridge, was taken into custody and charged with felony nighttime breaking and entering and possession of burglarious instruments.