Photo taken on March 29, 2013 shows a anti-smuggling vessel chasing a boat of suspect offshore east China's Zhejiang Province. A gangs smuggling case involving 15,000 tons of refined oil worthy over 100 million Yuan (approximately 15.9 million U.S. dollars) was seized here on Sunday, as announced by Hangzhou customs on March 31, it is the biggest ever gangs smuggling case offshore Zhejiang province. (Xinhua/Xu Yu)