A manhunt is underway for a suspect in a brutal Highland Park sex assault. Police say he approached a woman on Sunday as she walked on Harper Street, forcing her into the basement of an apartment building at gunpoint. Cops say he punched her in the face repeatedly before sexually assaulting her and then taking off. She ran to a neighbor's house where police found her covered in blood and holding a baby. They're looking for a black man in his 20s, five-seven, medium build who was wearing a red t-shirt, gray sweatpants and black jacket.