MINNEAPOLIS (AP) — A fourth person has died as a result of a mass shooting in Minneapolis earlier this week in which investigators believe a fifth person was killed in retaliation hours later, police said Friday.

A 34-year-old man was arrested Thursday on allegations that he was a perpetrator in a mass shooting Tuesday in Minneapolis shortly before midnight that left three people dead and two wounded. The shooting was the first of three on the city’s South Side within 20 hours that left a total of five people dead.