Ottawa police need the public's help to find a woman suspected in an unprovoked stabbing in the ByWard Market last week.

This blurry surveillance camera photo shows a woman suspected in the unprovoked stabbing of a 26-year-old man at the corner of George and Dalhousie streets on Aug. 14, 2015. (Photo supplied by Ottawa police) Police say a 26-year-old man was standing at the corner of George and Dalhousie streets on Aug. 14 around 5 p.m. when a woman came from behind and stabbed him in the lower back.

The victim and suspect did not know each other, police added.

Police said the woman is 21 or 22 years old, standing about five feet tall, with a thin build and blond hair with pink highlights.

She was last seen wearing a black dress with white shoes heading north on Dalhousie. She was also seen earlier on the day of the stabbing wearing a flower-print dress, as seen in the photo supplied by police.

Anyone with information about the stabbing suspect is asked to call Ottawa police at 613-236-1222, ext. 5166. Anonymous tips can be submitted by calling Crime Stoppers toll-free at 1-800-222-8477.