A tanker carrying Iranian oil that collided with a Chinese freight ship in the East China Sea was still on fire on Tuesday morning, the Chinese government said.

Dozens of rescue boats struggled to control the blaze for a third day.

Poor conditions, with heavy winds, rain and high waves, continue to hamper efforts to tame the fire and search for the 31 remaining crew members on the tanker, the Ministry of Transport said in a statement.

The body of a crew member was found on Monday in the water near the tanker, the ministry said.

It had been handed over to the civil affairs bureau.

Concerns were growing that the tanker may explode and sink while a flotilla of 13 search and rescue vessels comb a 900-square-nautical-mile area around the ship for the crew.

The tanker hit a freight ship on Saturday night in the East China Sea and burst into flames after spilling oil.

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

The Sanchi was carrying 136,000 tonnes of condensate, an ultra-light crude oil that becomes highly volatile when exposed to air and water, to South Korea.

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.

Chinese state media CCTV showed footage on Monday of boats dousing the flames with water as plumes of thick dark smoke continued to billow from the tanker. (dpa/NAN)