York Regional Police are seeking the public's help to identify a suspect caught on video before a "brazen" midday sexual assault.

An 18-year-old woman had just gotten off a bus in the Keele Street and Rutherford Road area around 1 p.m. Thursday and had walked to her home nearby when she was attacked, according to police.

"As she was unlocking the front door, she looked over her shoulder and saw a man outside on the street, on the sidewalk actually, (who) ran towards her, pinned her up against her front door (and) sexually assaulted her," Const. Andy Pattenden told CBC on Friday.

"She was able to fight him off and managed to go get help."

No weapons were used, he said, and the suspect fled on foot.

"This is a very brazen attack," Pattenden said.

Video from a security camera outside a nearby home caught the suspect on the street.

He is described as male, black, aged 18 to 25, standing about six-feet tall and weighing 200 pounds. He has short black hair and was wearing a grey t-shirt and black shorts.

"Just from viewing this video I'm pretty confident that someone out there is going to know who this person is and we need you to call us with that information," Pattenden said.

Anyone with information is asked to call the York Regional Police sexual assault unit at 866-876-5423, ext. 7071 or Crime Stoppers at 800-222-TIPS.