Three people are dead and another is in critical condition following a mass shooting at a birthday party on the city's Northwest Side early Sunday morning.

The shooting happened at the Vera Lounge, located in the 5500 block of West School Street around 2:26 a.m.

Police said an argument inside the bar turned into a fight that spilled outside in the street - that's when a man fired shots and fled in a dark-colored SUV.

The victims have since been identified by the Cook County Medical Examiner's Office.