Binghamton police detectives are working to determine whether three convenience store robberies in less than a week are connected.

The latest heist occurred at the Xtra Mart at 409 Court Street around 7:20 Monday night.

Investigators say a knife-wielding man wearing a ski mask fled on foot with some cash.

A Kwik Fill store at 267 Main Street on the West Side was robbed early Saturday evening.

Another robbery happened at a Hess Mart at 1153 Vestal Avenue on the South Side on Wednesday evening.

Police say weapons were not displayed in the first two incidents.

People with information about the robberies may contact the police detective bureau at 607.772.7080.