ALAMEDA COUNTY, CA. (THECOUNT) — Steven Carrillo has been identified as the as the active-duty U.S. Air Force sergeant accused in the Oakland, California federal courthouse shooting death of Protective Security Officer David Patrick Underwood. That shooting spree also injured another security officer.

Carrillo, who was stationed at Travis Air Force Base in Fairfield, California, is allegedly part of the “Boogaloo” movement, which is a term used by extremists to reference a violent uprising or impending civil war in the United States.

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A complaint called the shooting of Underwood and the other security officer a “premeditated attack. Carrillo is also accused of later murdering Sgt. Damon Gutzwiller, of Santa Cruz, California. Gutzwiller was killed Saturday. That incident reportedly involved explosives and occurred during the pursuit of suspect, 37-year-old Carrillo.

According to Heavy:

In a news release, DOJ announced that Carrillo would face murder and attempted murder charges for the courthouse shooting. In addition, Robert Alvin Justus, Jr., the alleged driver of the car Carrillo fired from, was accused of aiding and abetting charges. Justus told authorities he met Carrillo on Facebook, and the two arranged to meet so Carrillo could “give Justus a ride to protests that were taking place in Oakland,” the complaint says. However, it’s alleged the men were using the Black Lives Matter protest as cover; they weren’t intending to participate in it.

Underwood and an Officer Mifkovic were working “in an official capacity for Triple Canopy Inc., which is contracted with the Federal Protective Service to provide security at the Federal Building and Federal Courthouse,” the complaint says, adding that the shooting occurred “at a small security guard outpost.” You can read more about Underwood’s life here.

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Geo quick facts: Alameda County is a county in the state of California in the United States. As of the 2010 census, the population was 1,510,271, making it the 7th-most populous county in the state. and 20th most populous nationally. The county seat is Oakland – Wikipedia.