Quran Garner, 18, was charged with two counts of aggravated assault and two counts of aggravated assault on law enforcement officers, NBC10 reports.
Members of the US Marshals Service arrested a second suspect Monday night, Philadelphia police said. That suspect has yet to be identified.
At least four guns were fired in the shooting that killed Gregory Jackson, 34, Alexis Quinn, 27, and 22-year-old Kris Minners just before midnight Saturday, June 4 in the area of 400 South Street, according to DA Larry Krasner and those who knew the victims.
All were pronounced dead at hospitals.
Investigators told the news outlet that a fight between three men ignited the chaos.
DA Larry Krasner is expected to release more details soon.
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