WASHINGTON, Jan 19 (Reuters) - Prosecutors on Tuesday accused three people affiliated with a far-right militia group with conspiring to breach the U.S. Capitol, the first time they have directly accused people of organizing the violent uprising that left five people dead.

Thomas Edward Caldwell, 65, of Clarke County, Virginia, whom investigators said has a leadership role in the Oath Keepers group, was named in a criminal complaint as having participated in the Capitol riots by President Donald Trump's supporters. His fellow members Jessica Watkins, 38, of Champaign County, Ohio, and Donovan Ray Crowl, also of Ohio, were also charged.

Caldwell, Watkins and Crowl are accused of conspiring against the United States and conspiring to prevent the government from discharging its duties, among other offenses.

Caldwell, who told a federal judge on Tuesday he is on disability after retiring from the U.S. Navy, said he looks forward to proving at trial that "every single charge is false."

Jon Schaffer, a guitarist for the Indiana heavy metal band Iced Earth who was photographed during the riot wearing an Oath Keepers cap, also stands accused of using bear spray on police officers as the crowd tried to force its way past them, but was not named in the conspiracy.

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Investigators said Caldwell used Facebook to communicate with fellow members of the Oath Keepers and helped make hotel arrangements for their stay in the Washington, D.C. area. He later posted photos from the siege, saying: "Us storming the castle. Please share... I am such an instigator!"

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Watkins and Crowl appeared in the U.S. District Court for the Southern District of Ohio on Tuesday. Asked by a federal judge if she understood the charges against her, Watkins said: "I understand what you said. I don't understand how I got them."

A federal prosecutor told a judge in Caldwell's case it was "likely" additional charges could be on the table, including rioting and seditious conspiracy. (Reporting by Sarah N. Lynch; additional reporting by Jonathan Stempel in New York, and Brad Heath and Mark Hosenball in Washington; Editing by Dan Grebler)