China tightens water security for 2014 Boao Forum for Asia (1/5)

Staff members line up on a marine surveillance ship heading to Boao, south China's Hainan Province, April 4, 2014. A fleet of six marine surveillance ships will monitor maritime traffic safety, investigate maritime accidents, detect pollution, and carry out other missions during the Boao Forum for Asia Annual Conference 2014 in Hainan. (Xinhua/Wei Hua)