The FBI made an arrest in its nearly five-year-old investigation into who placed pipe bombs in Washington on the eve of the January 6 2021, riot at the US Capitol, a law enforcement official said.

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 arrest took place on Thursday morning, and the suspect is a man, the official said.

No other details were immediately available, including the charges the man might face.

The pipe bombs were placed on the evening of January 5 2021, near the offices of the Democratic and Republican national committees in the Di

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