WASHINGTON (AP) — The FBI on Thursday arrested a man accused of placing two pipe bombs outside the headquarters of the Republican and Democratic national parties in Washington on the eve of the U.S. Capitol attack, an abrupt breakthrough in an investigation that for years flummoxed law enforcement and spawned conspiracy theories about Jan. 6, 2021.

The arrest marks the first time investigators have publicly identified a suspect in an act that has been an enduring mystery for nearly five years in the shadow of the violent Capitol insurrection .

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The suspect was identified as Brian J. Cole Jr., 30, of Woodbridge, Virginia, but key questions remain unanswered after his arrest on explosives charges, including a possible motive and what connection if any the act

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