A violent mob of protesters breached a US Immigration and Customs Enforcement (ICE) facility in Portland, Oregon, on Saturday night, injuring four federal officers, according to authorities.

In a statement responding to Saturday protests, Mayor Keith Wilson pledged that Portland police will uphold the law in the city, but will “not be used as agents of ICE.”

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.

Trump sent federal officers into Portland to quell riots five years ago. A tired city — watching events in LA — hopes it won’t happen again.