Rescue crews yesterday wrestled to bring a blaze on an Iranian oil tanker off China's east coast under control as fire raged for a second day following a collision with a grain ship, while the body of one of the 32 missing crew members was found on aboard.

Concerns were growing that the tanker, which hit a freight ship on Saturday night in the East China Sea and burst into flames, may explode and sink, the official China Central Television (CCTV) said yesterday, citing experts on the rescue team.

Poor weather continued to hamper the rescue work, Lu Kang, a spokesman at China's foreign ministry, told a regular news briefing.

The size of the oil spill from the ship and the extent of the environmental harm were not known, but the disaster has the potential to be the worst since 1991 when 260,000 tonnes of oil leaked off the Angolan coast.

The remains of one of the 32 mariners on board were found yesterday afternoon, Iranian and Chinese officials confirmed.

Mohammad Rastad, head of Iran's Ports and Maritime Organisation, was quoted by the ISNA news agency as saying that the body had been sent to Shanghai for identification. The fate of the remaining 31 sailors is not known.

The Sanchi tanker (IMO:9356608) run by Iran's top oil shipping operator, National Iranian Tanker Co, collided with the CF Crystal (IMO:9497050) on Saturday evening about 160 nautical miles off China's coast near Shanghai and the mouth of the Yangtze River Delta.

Chinese state media CCTV yesterday showed footage of a flotilla of boats dousing the flames with water as plumes of thick dark smoke continued to billow from the tanker.

One portion appeared to show the fire had been extinguished, although this could not be independently confirmed.