A police officer in a protective suit takes part in a chemical, biological, radiological and nuclear field exercise for the East Asian Games in Hong Kong October 27, 2009. China, Guam, Hong Kong, Japan, Macau, North Korea, South Korea, Mongolia and Taiwan will take part in the East Asian sports event to be held in the territory between December 5 and 13. REUTERS/Tyrone Siu (CHINA POLITICS SPORT IMAGES OF THE DAY) - RTXQ1OD