Chicago police issued a community alert after a woman was sexually assaulted in Humboldt Park.
The attack happened near Western and Augusta Boulevard early Monday morning.
A man attacked a woman inside a bus stop shelter.
He then took her to a gangway, where he beat and sexually assaulted her.
No arrests have been made.
Police released a vague description of the attacker, but they say he had diamond studded earrings in both ears.