WASHINGTON (AP) — The FBI made an arrest on Thursday in its nearly 5-year-old investigation into who placed pipe bombs in Washington on the eve of the Jan. 6, 2021, riot at the U.S. Capitol, a law enforcement official told The Associated Press.

The arrest marks the first time investigators have settled on 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 siege.

The official who described the arrest was not authorized to publicly discuss a case that has not yet been made public and spoke on the condition of anonymity. The arrest took place Thursday morning, and the suspect is a man, the official said. No other details were

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