Two men charged with murder in last week’s shooting after the Kansas City Chiefs’ Super Bowl parade were strangers who pulled out guns and began firing within seconds of starting an argument, according to court documents released Tuesday.

Missouri prosecutors said at a news conference that Lyndell Mays, of Raytown, Missouri, and Dominic Miller, of Kansas City, Missouri, have been charged with second-degree murder and several weapons counts in the shooting that left one person dead and roughly two dozen others injured.

Both men were shot during the melee, according to probable cause affidavits. Both have been hospitalized since, Jackson County prosecutor Jean Peters Baker said during a news conference.

The argument began when two groups of people grew agitated over the belief that people in the other group were staring at them, according to affidavits from police. Surveillance video shows Mays and someone with him aggressively approached the other group, police say.