A man tried to sexually assault a woman early Sunday as she walked to a Blue Line station on the Northwest Side.

The 37-year-old woman was walking through a parking garage in the 8400 block of West Bryn Mawr Avenue about 4 a.m. when she noticed a man, according to a community alert from Area North detectives.

The man approached her from behind, knocked her to the ground and demanded she remove her clothing, police said. The woman struggled and was able to run to safety.

The suspect ran south from the parking lot, police said. He was described as a black man between 24 and 26 years old, 5-foot-5 to 5-foot-7, 130 to 140 pounds with black hair, brown eyes, a light complexion and wearing a gray hooded sweatshirt.

Anyone with information about the robberies is asked to call detectives at (312) 744-8261.