A 37-year-old woman was waiting for an Uber about 11:20 p.m. in the lobby of a building in the 100 block of South Wacker Drive, according to Chicago police.
Police say a Black male entered the lobby, wrapped his arms around her in a "bear hug" and lifted her off the ground.
The suspect allegedly rubbed the woman's "vaginal area", over her clothing, according to a police report.
(Chicago Police Department)
The man fled when another person entered the lobby, police said.
The suspect is described as a Black male in his mid-to-late 20's, standing between 6-foot-1 and 6-foot-3, between 160 and 180 pounds, police said. He also had short, dreadlock-style hair.
Police ask anyone with information to contact Area 3 Detectives at 312-744-8261.
A previous version of this article erroneously stated the incident occurred in the lobby of 100 South Wacker Drive. The incident occurred in a building lobby in the 100 block of South Wacker.