Police are investigating a report that a 13-year-old girl was grabbed by the arm at around 6 p.m. Monday by an unknown man at Windsor and Palermo streets in the Wellington-Harrington neighborhood. The girl was able to shake him off and get away.

The girl, who had been walking home from the Frisoli Youth Center when she encountered the man, described him to police as being white, middle-aged and around 5-foot-7, with a gray beard and a dark jacket with a hood.

Extra patrols and a non-uniformed presence have been sent to Wellington-Harrington, and police are working closely with the family, youth center and school department, said Jeremy Warnick, director of communications and media relations for Cambridge police.

Police are looking for witnesses who may have noticed anything suspicious during or around the time, or video surveillance from residents or businesses in the area.