As merriment turned to terror around Richmond’s Monroe Park, other people were hurt as they tried to escape the gunfire, including a 9-year-old girl who was hit by a car, Richmond Interim Police Chief Rick Edwards told reporters Tuesday night as quoted by CNN.

Police initially detained two people but later said one was not involved. The other – a 19-year-old who investigators think may have known one of the victims and had four handguns – was held Tuesday night and police will recommend two counts of second-degree murder against him, Edward told the news channel.

The shooting happened at Monroe Park after Huguenot High School’s ceremony in the Altria Theater, Richmond Public Schools official Matthew Stanley told CNN.