Two men and two women were killed, all in their 20s, according to police. The two men were identified as Leon Andrew Henry, 25, and Devonte Terrell Williamson, 23, according to the Cook County Medical Examiner's Office.

Detectives on Friday continued to search for both the shooter or shooters and the motive behind Wednesday night's mass shooting in the River North neighborhood that claimed four lives and wounded more than a dozen others.