Law enforcement sources tell TMZ the arrest occurred at 3 p.m. in Terminal 5. Williams, a popular comedian who recently starred in his own HBO stand-up comedy special, was stopped at the security checkpoint. Security officers found a concealed weapon in his carry-on luggage. The LAPD was called and Williams, who is also a popular rapper, was arrested. Cops determined the concealed weapon was stolen. They also found three additional weapons in luggage that Williams had already checked in.