Woman sexually assaulted on charter bus on West Side, police say

CHICAGO (WLS) -- Chicago police are looking for a man they said sexually assaulted a woman on a charter bus parked on the West Side.

The assault happened at the bus yard in the 4500-block of West Grenshaw Street on Sunday, police said

The 20-year-old victim said her attacker was armed with a gun and demanded she get on the parked charter bus. Police said he then sexually assaulted her on the bus.

Chicago police are investigating and no one is in custody.