Smoke fills the corridor outside the Senate Chamber as rioters are confronted by police on January 6, 2021. Manuel Balce Ceneta, AP Thomas Edward Caldwell, leader of a far-right militia group, is being investigated by the FBI. He is accused of coordinating an effort to locate lawmakers during the Capitol siege, an affidavit reveals. Several Facebook messages gave specific directions as to the whereabouts of members of Congress. Visit Business Insider's homepage for more stories. Thomas Edward Caldwell, leader of the far-right militia group Oath Keepers, has been accused by the Federal Bureau of Investigation of coordinating an effort to track down lawmakers during the siege of the US Capitol building.Caldwell, 66, is cited with leading the effort to locate members of Congress, according to The Washington Post.Two others, Donovan Ray Crowl and Jessica Marie Watkins, are also accused of having conspired with the Navy veteran, The Post reported.Caldwell is said to have received Facebook messages updating him of the specific whereabouts of lawmakers while congressional offices were being ransacked, according to a sworn affidavit included in court filings obtained by the George Washington University Program on Extremism.Read more: I went inside the US Capitol's immense security bubble to cover the most surreal presidential inauguration of my lifetime.