Key Facts

• The shooting happened shortly before 8 p.m. Saturday near Florida A&M University’s Bragg Stadium, after a homecoming football game.
• Police said an altercation between two groups who knew each other preceded the shooting.
• Six adults and six minors were injured; all but one had gunshot wounds.
• Three victims were seriously hurt, including one who was in critical condition, police said.
• Police said Rivers was arrested Sunday and announced the arrest Monday.
• Rivers faces 11 counts of attempted second-degree murder and one count of firearm possession by a delinquent.
• Police said none of the people struck was believed to be an intended target and that further arrests were possible.
• The Gun Violence Archive recorded 386 U.S. mass shootings so far that year, using a definition of at least four people wounded or killed.