The Killers, Gigi Perez, Babymetal, Devo, Isley Brothers and 600 more acts are playing the Milwaukee festival June 19-21, June 26-28 and July 3-5.

Milwaukee police have been at the scene overnight, and rotating shifts all day. The Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) was there at 8 a.m. investigating.