Police have released images taken from CCTV cameras of a man they want to identify in connection with a sexual assault over the weekend in northeast Calgary. (Calgary Police Service )

Calgary police have released CCTV surveillance images in connection with a sexual assault that happened early Sunday morning.

A teenage girl was walking in the area of 36th Street between 24th Avenue and Rundlehorn Drive N.E. at about 5:30 a.m. when a man approached her and tried to engage her in a conversation.

He then forced the victim into a nearby vestibule where he threatened and sexually assaulted her, police said.

Investigators are looking for a dark-skinned man, possibly aboriginal, roughly 18- to 25-years-old and between five feet, eight inches and six feet tall.

The culprit had a heavy build, dark hair and was wearing a flat-brimmed black and silver baseball cap.

He also wore a New Orleans Saints jersey with the number 25 on it, a large silver chain around his neck, a black winter jacket with a red liner, white runners with the tongue sticking out and dark, baggy jeans.

Anyone with information about the incident is asked to contact Crime Stoppers or police.