Rescuers work on a rescue ship at the site where a cargo vessel sank following a collision with another vessel, at Wusongkou anchorage in Shanghai yesterday. Ten sailors were missing after the Changping, loaded with 5,000 tons of steel, collided with another freighter in the anchorage near the Yangtze River estuary Tuesday night. Thirteen sailors were on aboard when the accident happened. Only three have been rescued so far. Xinhua