GORHAM — Gorham police are looking for a man who robbed an ATM customer on Main Street Tuesday.

A customer at the Key Bank automatic teller machine reported to police that at 6:45 p.m. he was approached by a man with a knife who tried to force him to withdraw money.

The suspect was unable to access the victim’s account and instead stole a small amount of money from the customer and ran, according to Gorham Detective Sgt. Dana Thompson.

The robber was last seen climbing over a fence at the back of 45 Main St. and running toward Preble or Elm streets.

He is described as between 5 feet 6 inches and 5 feet 8, with short brown hair and wearing a plain black baseball cap, a black jacket and tan shorts.

Police said the incident appears to be isolated but encouraged residents ot be vigilant and to call police if they see someone suspicious near an ATM.