A helicopter patrols over the beach volleyball venue during an anti-terrorist drill in Chaoyang Park of Beijing, capital of China, June 11, 2008. China on Wednesday launched series of anti-terrorist drills at the national level dubbed "Great Wall 5" to cope with possible terror attacks during the Beijing Olympics. The week-long drills will involve police forces, the People's Armed Police, the People's Liberation Army and the health, environmental protection, meteorology and transportation departments. The drills will include missions to deal with a chemical attack, hijacking athletes' buses and other possible contingencies. (Xinhua Photo)