The FBI has arrested the man caught on video outside a Newark, New Jersey detention center threatening to kill an Immigration and Customs Enforcement officer, his wife and children, acting Attorney General Todd Blanche said Friday night on X. 

He had promised on The Will Cain Show that the man would be found. "FAFO," Blanche wrote Friday, using a vulgar acronym for accountability, without identifying the man.

"I'll kill your whole f---ing family," the unidentified man shouted at an agent, repeatedly pointing at him, as ICE officers held the line against rioters at the sixth night of protest outside the Delaney Hall detention center Thursday night. 

"Your whole f---ing family is dead. Your children and wife, all dead. I have your face mother---er! All dead!" the rioter yelled, his face also uncovered.

The Department of Justice also announced Friday that New Jersey resident Brendan John Geier, 26, had been charged with assaulting federal officers and causing bodily injury by allegedly biting and kicking them at the Thursday night Delaney Hall riot.

Department of Homeland Security Secretary Markwayne Mullin alleged Geier "savagely bit an ICE law enforcement officer outside of Delaney Hall." U.S. Attorney Robert Frazer for the District of New Jersey said Geier "responded to lawful orders from federal officers by kicking one and biting two others."

Certain ICE deportation officers were assigned to conduct perimeter enforcement for the facility, which included clearing the road leading to and from the facility for vehicles.

As ICE deportation officers tried to clear the road of demonstrators blocking the facility around 10:30 p.m., they "formed into a line and began to move towards the group of demonstrators, which included Geier," telling  them to "move back," the DOJ statement said.

"Geier instead engaged in a struggle with deportation officers, kicking officers and ultimately biting an officer’s forearm, and another’s knuckle," it said.

DHS told Fox News nine people were arrested in the Thursday riot.