Ottawa police are once again asking for help to identify a knife-wielding robbery suspect who possibly smelled like kitchen grease.

It happened two weeks ago at the Mac's Milk convenience store on Alta Vista Drive, and you can watch a video of the incident above.

It shows a man, believed to be in his 50s, entering the store on Aug. 13 at 1:45 a.m. and asking for cigarettes, police said.

He then took out a long knife and demanded more cigarettes as well as lighters and cash. Police said he spoke English and Arabic.

No one was hurt.

The suspect is described a Caucasian or middle-eastern man, about 50 to 55 years old, standing at about five feet five inches tall.

He has grey hair and a salt-and-pepper beard, and at the time of the robbery he was wearing black pants and a navy blue short-sleeved shirt with large horizontal stripes.

A police news release said the man "possibly smelled of kitchen grease."

Anyone with information is asked to call the robbery unit at 613-236-1222, ext. 5116, or Crime Stoppers at 613-233-8477 (TIPS) — toll free at 1-800-222-8477.