Federal authorities have arrested a Virginia man in connection with the placement of two pipe bombs outside the headquarters of the Republican and Democratic National Committees the night before the Jan. 6, 2021, attack on the U.S. Capitol, sources familiar with the matter tell ABC News.

The suspect is expected to faces charges for allegedly planting the devices -- which investigators later determined were viable explosives that if detonated could have resulted in "serious injury or death" -- marking an extraordinary development in one of the most high-profile federal investigations in recent history.

It's not clear the full scope of evidence authorities have gathered allegedly tying him to the planting of the bombs.

The arrest comes nearly five years after the discovery of the pi

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