A 23-year-old woman was sexually assaulted in Towson last Thursday.
Baltimore County Police said it happened around 7:40 p.m. on York Road near Dumbarton Road. They said the man came up behind her, sexually assaulted her and ran away.
She went to a nearby home to get help.
The woman described the suspect as a black man with a medium complexion, 5'3 - 5'5, wearing a dark hooded sweatshirt.
Anyone with information is asked to contact Baltimore County Police at 410-307-2020.