A policeman stands amid smoke at the arrival gate B after an explosion at the Terminal 3 of Beijing Capital International Airport in Beijing, July 20, 2013. A man in a wheelchair detonated a home-made explosive in Beijing airport on Saturday evening, injuring himself and sending smoke billowing through the exit area of the international arrivals section of Terminal 3. REUTERS/Stringer (CHINA – Tags: DISASTER CIVIL UNREST TRANSPORT) CHINA OUT. NO COMMERCIAL OR EDITORIAL SALES IN CHINA – RTX11SRM