Ottawa police are searching for two male suspects wanted for robbing a west-end gas station at gun- and knife-point.

Police responded to the robbery at the Esso gas station in the 3000 block of Richmond Road at about 4:30 p.m. Monday. Police say one man was armed with a hand gun; the other with a knife.

A lone attendant was working at the time of the robbery. He told police the suspects tied him up and then made off with a cash register containing an unknown amount of cash.

The worker managed to untie himself a short time later and watched the suspects flee in a dark blue vehicle, police say. The attendant was uninjured.

Police say the first suspect is described as a white male who is about five feet three inches tall. Police say he was armed with a knife.

The second suspect is described as being Lebanese. He is about five feet 11 inches tall and police say he was armed with a hand gun.

Both men have heavy builds and were wearing dark clothing and black balaclavas to cover their faces. The suspects are described between 25 and 30 years old.

Anyone with information about the robbery is asked to contact Ottawa police at 613-236-1222, ext. 5116 or Crime Stoppers at 613-233-8477 (TIPS).