A surveillance photo released by the FBI shows a person suspected of leaving pipe bombs at the Republican and Democratic National Committee headquarters in Washington, DC, on January 5, 2021. FBI/Reuters

The quiet calm of a weekday morning in a Woodbridge, Virginia, neighborhood was suddenly interrupted Thursday by a loud siren, two Humvee-style vehicles and a group of SWAT-like figures in camouflage, rifles trained on a house.

“This is the FBI. We have a federal search warrant,” the voice coming over a loudspeaker said, according to a neighbor. “Come out of the house with your hands up.”

The ensuing arrest of a 30-year-old recluse who lived with his parents resolves, Justice Department officials said, a mystery that had vexed investigators across three presidential administrations:

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