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, sources confirmed to The Associated Press and NBC News.

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.

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An FBI official told NBC News the arrest took place Thursday morning, and a law enforcement official confirmed to the AP that the suspect is a man. No other details were immediately available, including the

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