WASHINGTON — A mob of rioters ambushed Immigration and Customs Enforcement agents in San Francisco, with one knife-wielding, keffiyeh-clad agitator threatening to “stab” one of the feds and “go after” his family, according to a criminal complaint filed Thursday.

Adrian Guerrero was charged with assaulting an officer and destruction of property over the alleged Wednesday attack on ICE officers in the Enforcement Removal Operations division , federal prosecutors said.

“I’m going to f–k you up,” Guerrero seethed while allegedly wielding a black knife and wearing what appeared to be a black-and-white checkered keffiyeh headscarf and orange-tinted goggles, according to photos in the complaint filed by the Department of Homeland Security. 4

He also screamed that he was “going to go a

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