WASHINGTON — A man was arrested Thursday in the FBI's nearly 5-year-old investigation into pipe bombs placed outside the headquarters of the Republican and Democratic national parties in Washington on the eve of the Jan. 6, 2021, riot at the Capitol and has been charged with explosives offenses, prosecutors said.

The arrest marks the first time investigators have publicly identified a suspect in an act that had long vexed law enforcement, spawned a multitude of conspiracy theories and remained an enduring mystery in the shadow of the dark chapter of American history that is the violent Capitol insurrection .

The suspect in custody has been identified as Brian Cole Jr., of Woodbridge, Virginia, though officials offered no details about a motive or whether the placement of the bombs,

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