MILWAUKEE (CBS 58) -- Milwaukee police say they are investigating a quadruple shooting that occurred on Sunday, March 20, at approximately 4:21 a.m. 

According to a report, one or possibly multiple suspects fired several gunshots during an argument that took place during an after-set party on 28th and Melvina.

A 24-year-old Milwaukee man sustained life-threatening injuries and is in critical condition. The additional victims are a 28-year-old Milwaukee woman, a 28-year-old Milwaukee man and a 23-year-old Milwaukee man, who all sustained non-fatal injuries. All the victims arrived at local hospitals for treatment.

Anyone with any information is asked to contact Milwaukee Police at (414) 935-7360 or to remain anonymous, contact Crime Stoppers at (414) 224-Tips or the P3 Tips App.