It was just before 11 p.m. when the woman got off a bus in the 4200 block of South Dawson Street. She was walking north by herself on 42nd Avenue when she heard the sound of someone running up behind her, according to police.
Before she could react, police say a man grabbed her from behind. He covered her mouth with one hand and used the other to grab her groin, police say.
The attacker than tossed the woman onto the ground and jumped on top of her. With one hand still covering her mouth, the attacker straddled the woman and continued groping her, according to police.
The victim was able to bite the attacker's hand, which allowed her to scream out for help. Between the bite and the screaming, the attacker was spooked and began running westbound on South Dawson Street.
The victim ran to a nearby residence for help.
A witness told police they saw the attacker running north on Rainier Avenue South, and surveillance video shows him getting into a car and driving away. Police used a K-9 unit to search the area, but the man was already gone.
Police say the attacker was wearing something similar to a ski mask with holes cut out for his eyes and mouth. They believe he's a black man who stands roughly 5'11" tall and weighs 200 pounds. He has short hair and was wearing a dark blue jacket, blue jeans and white shoes.
Anyone with information about the crime is asked to call the police.