"Oakland Police responded to a late night call that protesters had broken into and occupied a downtown building and set several simultaneous fires," the statement read. "The protesters began hurling rocks, explosives, bottles, and flaming objects at responding officers. Several private and municipal buildings sustained heavy vandalism. Dozens of protesters wielding shields were surrounded and arrested."
Protesters reported running from several rounds of tear gas and bright flashes and deafening pops that some thought were caused by "flash bang" grenades. Fire crews arrived and suppressed the flames.