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The Eastern Villa Apartments are two rows of slate-gray buildings in a residential neighborhood on the outskirts of Sacramento. On Wednesday morning, residents awoke to their parking lot filling with black S.U.V.s and F.B.I. agents swarming toward the corner unit of the apartment complex. The heavily armed federal authorities, with help from the Sacramento Sheriff’s Office, arrested Omar Ameen, 45, an Iraqi citizen whom they accused of being a longtime member of Al Qaeda and the Islamic State.

“We were all looking and saying, ‘What is this?’” said Greg Hutson, 65, an Uber driver who was one of Mr. Ameen’s neighbors. “He didn’t do anything while he was here that hinted that he was part of a terrorist organization.”

Federal authorities accused Mr. Ameen of killing an Iraqi police officer in 2014 and then lying on his successful application for refugee status in the United States.

An Iraqi court in May issued an arrest warrant for Mr. Ameen. According to a summary of the case by the Justice Department, Mr. Ameen was in a convoy of ISIS vehicles that entered Rawah, Iraq, in 2014. Mr. Ameen is accused of traveling to the house of an Iraqi police officer in Rawah, firing at him and then firing again when the officer was on the ground, killing him.