Multiple people have been arrested following a violent riot outside an Immigration and Customs Enforcement (ICE) facility in Portland, Oregon, that involved knife-throwing and explosives. A Department of Homeland Security spokesperson told Fox News Digital that one of the rioters had tried to fire a Roman Candle' firework at law enforcement. The same person allegedly threatened officers with a large knife by swinging it and then throwing it at them, the spokesperson said. No law enforcement officers were seriously injured during the attack, according to officials. While the suspects' identities have not yet been released, DHS confirmed there have been three arrests. "Unfortunately, these violent attacks are becoming more and more common," the spokesperson said. "Our ICE law enforcement is now facing a 500% increase in assaults while carrying out enforcement operations.