NEW : Obama , one drove up to Capitol Hill barricade with a rifle in his vehicle . NEW : Kimberly Schneider identified the man as Alfred Brock , 64 , of Winnfield , Louisiana . Brock charged with possession of an unregistered firearm , ammunition . Police say he told them he had a delivery for President Alfred Brock . Man was arrested , transported to Capitol police headquarters for processing .
NEW : Obama , one drove up to Capitol Hill barricade with a rifle in his vehicle . NEW : Brock charged with possession of an unregistered firearm , ammunition . Police say he told them he had a delivery for President Alfred Brock . Man was arrested , transported to Capitol police headquarters for processing .