A search of his truck turned up several rounds of ammunition , Schneider said . NEW : Alfred Brock , 64 pulled up to Capitol barricade with a rifle in his vehicle . NEW : Brock charged with possession of an unregistered firearm , arrested . Police said he told them he had a delivery for President Obama . Brock was arrested , transported to Capitol Hill police headquarters for processing .
NEW : Alfred Brock , 64 pulled up to Capitol barricade with a rifle in his vehicle . NEW : Brock charged with possession of an unregistered firearm , arrested . Police said he told them he had a delivery for President Obama . Brock was arrested , transported to Capitol Hill police headquarters for processing .