A demonstration to keep controversial “alt-right” speaker and Breitbart editor Milo Yiannopoulos from speaking at the University of California, Berkeley has turned into an impromptu march.

Campus police called off the event and issued a dispersal order shortly after 6 p.m., about an hour before Yiannopoulos was scheduled to appear. Demonstrators launched fireworks at the Martin Luther King Jr. Student Union building where police stood guard while releasing tear gas, pepper spray, percussive grenades and rubber bullets. At one point demonstrators set a mobile floodlight ablaze.

Protesters chanted, “No Trump. No KKK. No fascist USA” before marching down Bancroft toward downtown Berkeley.

The story is still developing and photographers are still on the scene.