Winnipeg police are searching for a man who they say assaulted a Polo Park security guard with a knife and some sort of chemical substance.

Police officers were called just before 11 a.m. CT Monday to the shopping centre on the 1400 block of Portage Avenue, where two security guards were trying to catch a man who had fled a store with stolen merchandise.

The suspect ran toward a waiting car and "dispensed a chemical towards the security guards as well as produced a knife," police stated in a release.

Police did not specify what kind of chemical was used, nor did they elaborate on how it was dispensed towards the security guards.

One of the guards was taken to hospital with injuries to his upper body. He is in stable condition, according to police.

Police described the suspect as being about 26 to 30 years old and six feet tall with short dark hair.

The suspect escaped in a blue 2006 Chevrolet Optra that had been previously reported stolen. The car's licence plate number is GCP 273, according to police.