Police declared the demonstration a riot. Federal officers clad in tactical gear deployed smoke, tear gas, flash grenades and other projectiles as some in the restive crowd of several hundred demonstrators hurled water bottles and fireworks in return.

Federal officers in tactical gear are clashing with demonstrators and deploying smoke, tear gas and flash grenades, the Oregonian reports.

Hundreds of protesters have gathered outside of the Portland U.S. Immigration and Customs Enforcement building after a “No Kings” march in the downtown and Central Eastside area brought tens of thousands of demonstrators on Saturday afternoon.