Calgary police sexual assault photo

Calgary police released a photo of a man they believe has information about a series of sexual assault. (Calgary Police Service)

Calgary police are looking for a man believed responsible for three sexual assaults in the city.

The first incident happened in August when a woman walking in the 500 block of Heritage Drive southwest was grabbed from behind. She screamed and he ran away, say police.

On Sept. 12, a woman was walking in a green space in the same area when a man exposed himself to her. Again, she yelled and he ran away.

The third incident happened last week on the bus from the neighbourhood of Skyview to Saddleridge when a man tried to run his hand up a woman's thigh.

"All three victims were between the ages of 16 and 22. Although all three descriptions differ slightly, investigators believe all three cases may be related," police said in a statement Monday.

The man is described as five feet eight inches tall with a slim build and short scruffy hair.

Police released a photo Monday of a man who may have information about the incidents.