Carrillo is the suspect charged with killing Santa Cruz County Sheriff Deputy Damon Gutzwiller and wounding of four other officers in an ambush-style attack on June 6 in Ben Lomond, an unincorporated area about 10 miles north of Santa Cruz.
The FBI said a suspected accomplice has also been arrested: Robert Alvin Justus Jr., a resident of Millbrae, California. He is charged with aiding and abetting in the murder of Pat Underwood and attempted murder of a second security officer, who was critically injured in the shooting.
The two contract security officers worked for Homeland Security's Federal Protective Service and had been monitoring a nearby protest over the death of George Floyd.
Deputy killed, 2 other officers injured after being ambushed in Santa Cruz County
The U.S. Attorney just said the van used in Oakland Federal Building shooting was also used in the Santa Cruz Co. attack. Authorities say that Justus is believed to have been the driver of the van during the Oakland attack while Carrillo was the shooter.
Authorities say Carrillo used a privately made machine gun with a silencer in the shooting.
John Bennett, Special Agent in Charge of the FBI in San Francisco, said Carrillo and Justus used the protests on May 29 as a cover. "They came to Oakland to kill cops."
"We believe Carrillo and Justice chosen this date, because the planned protest in Oakland, provided an opportunity for them to target multiple law enforcement personnel and avoid apprehension to the large crowds attending the demonstrations, as described in detail in the complaint," Bennett said.
Messages exchanged that day indicated a plan to travel and attack federal law enforcement officers.
Carrillo, according to authorities, used "his own blood" to write phrases in one of the cars he allegedly carjacked. And the phrases, the U.S. Attorney explained are associated with the Boogaloo movement.
"The boogaloo term is used by extremists to reference a violent uprising or impending war in the United States," Anderson said.
Carrillo is currently being held without bail in jail in Monterey County. He is expected to enter a plea to the state charges on Wednesday.