On Saturday, the Panama-flagged Iranian Sanchi was bringing its cargo of oil from Iran to South Korea when it collided in the East China Sea with the Hong Kong-registered CF Crystal, carrying grain from the US. Among the crew of 30 Iranians and two Bangladeshis, one body has been found, the rest are missing. The collision occurred in the Yangtze River Delta, about 260km off the coast of Shanghai. The cause of the collision is not yet known. But the Iranian tanker continues to pose an environmental disaster after leaking toxic oil for two days and could explode at any moment.