A Greek man was arrested at Athens International Airport early Sunday after a loaded pen gun was found in his carryon luggage before he boarded a flight to a Greek island, police said. The 30-year-old man, whose name was not immediately released, was preparing to board a domestic flight to the eastern Aegean Sea island of Mytilene when police found the pen gun, loaded with a 22-millimeter bullet. The gun, which was attached to the man's keys, resembles a pen but can shoot a bullet. Police said the man was arrested for violating Greece's gun laws and would be charged on Monday.