WASHINGTON - An armed man crashed his vehicle into a security barricade at the U.S. Capitol on Monday, ran into the building and was arrested, forcing the complex to briefly be locked down, authorities said. The man was armed with a gun, said one security officer speaking anonymously pending an official briefing. The officer said the man was captured by police after running through the Rotunda in the center of the Capitol and down a stairway into the basement. He said the man appeared to be having a seizure, and was taken to a hospital. A congressional aide said the...