Ottawa police are hunting for a knife-wielding man after a gas-station robbery in the city's west end.

Police say a man walked into the Esso gas station on the 1500 block of Merivale Road at about 10:40 p.m. on Tuesday.

He demanded money from the clerk and got away with an undisclosed amount.

The suspect is described as a white man between 20 and 25 years old. At the time of the alleged robbery he wore a black mask, black jacket, and white running shoes.

No injuries were reported.

Police want anyone with information to contact the Robbery Unit immediately at (613) 236-1222 ext. # 5116 or Crime Stoppers at (613) 233-8477 (TIPS).