SACO — Saco police are investigating a strong-arm robbery that occurred this afternoon in Pepperell Square.

Deputy Chief Jeffrey C. Holland said a 23-year-old Arundel woman, who was getting out of her car near Common and Front streets, was accosted by a man around 12:22 p.m.

The suspect grabbed her purse and fled onto railroad tracks with the woman in pursuit. When she caught up to the man, he turned and threatened to assault her. She let him go.

The victim spoke with two men, who witnessed the robbery, but they had left by the time police arrived.

The purse snatcher is described as being in his late 20s with short black hair and brown eyes. He is 5-foot-8 and was wearing a baseball-style hat with a blue bill and red cap, a dark blue hoody sweat shirt, blue jeans and black sneakers.

Anyone with information concerning the suspect should contact police at 284-4535.