A federal courthouse was locked down Thursday and the courtrooms sealed after officials announced a man had escaped from U.S. marshals inside the building. Officials announced over intercoms that they were searching floor-by-floor. It wasn't immediately clear if the man was armed. Larnell Rogers, who was accused of lying to an ATF agent and scheduled to appear in court, fled after learning a warrant had been issued for his arrest, U.S. Marshals spokesman Kim Widup said. Authorities instructed court officials to lock all doors in the Everett M. Dirksen Federal Building "out of an abundance of caution," Widup said. Rogers...