A crowd of Trump supporters
stormed the building - the heart of America s democracy - during violent clashes with police on 6 January following an address by the outgoing president.
Suspects Jessica Watkins and Donovan Crowl are facing unspecified federal charges brought by the Department of Justice.
They are being held in Montgomery County Jail in Ohio after turning themselves in to authorities on Sunday.
The FBI said Watkins posed a video on the microblogging site Parler on 6 January where she said Yeah. We stormed the Capitol today. Teargassed, the whole, 9. Pushed our way into the Rotunda. Made it into the Senate even, according to an affidavit reported by local media.
America is finally waking up to the problems caused by its polarising politics.
And if Sky News investigations into one small community in mid-west Ohio are anything to go by, it is going to be one heckuva big, continual challenge - long after the US inauguration on Wednesday.
The Sky team in Ohio tracked down several members of a militia group who were part of the crowd that stormed Washington s Capitol building on 6 January. Image: Donovan Crowl and Jessica Watkins pictured outside the US Capitol building
Our forensics unit sifted through hours of footage taken on the day to pinpoint them in the midst of the Washington mob.