Calgary police are turning to the public for help in finding a suspect in a sexual assault case.

Sex assault suspect

Police now releasing a composite sketch of the first suspect in a sexual assault that took place Monday. (Calgary Police Service)

A woman said she was physically and sexually assaulted by two men in an alley in northeast Calgary. 

She arrived on foot at a convenience store in Coral Springs at 8 a.m. Monday morning and asked staff to call police.

"It's believed the woman was sexually assaulted in the vicinity while she was walking home, and while the crime scene has not yet been located, it is believed the assault occurred in the Falconridge area between 6 a.m. and 8 a.m.," said police in a release.

"The victim told investigators she was walking in an alleyway when she was approached by two men. One of the men struck her in the face and then sexually assaulted her."

Calgary police have released a composite sketch of one of the suspects.

The second suspect is described as an aboriginal man with long hair in a braid. He was wearing black jeans and a black, half-zip hoodie.

Police said the woman ran from the scene after the assault and attempted to flag down two separate motorists to help, but neither stopped.

At that time, she had been walking on the west side of 68 Street south between McKnight Boulevard and Falshire Drive N.E. in only a sweatshirt.

Police are looking to speak to the two motorists and anyone with information is being asked to contact Crime Stoppers.