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Flames and smoke from the Iranian oil tanker Sanchi is seen in the East China Sea, on January 15, 2018 in this photo provided by Japan's 10th Regional Coast Guard. 10th Regional Coast Guard Headquarters/Handout via REUTERS

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TOKYO (Reuters) - Japan sees little chance of the oil spill from a stricken Iranian tanker that sank on Sunday in the East China Sea reaching its shores, an official at the nation's environment ministry said on Tuesday.

The large tanker Sanchi (IMO:9356608) sank in the worst oil ship disaster in decades and produced a large oil slick, Chinese media and Japanese authorities said on Monday, as worries grew over damage to the marine ecosystem.

The vessel's crew of 30 Iranians and two Bangladeshis are all believed to have perished in the incident.

"Oil spills in general can have a big environmental impact if they reach the coast, but we think that there is little chance of that happening on Japanese seashores for now," the official who helps oversee the marine environment for the ministry told Reuters by telephone. He declined to be named as he was not authorised to speak to media.

The tanker had been adrift and ablaze after crashing into the freighter CF Crystal (IMO:9497050) on Jan. 6. Strong winds pushed it away from the Chinese coast, where the incident happened, and into Japan's exclusive economic zone (EEZ).

The ship, which had been carrying 136,000 tonnes - almost 1 million barrels - of condensate, an ultra-light, highly flammable crude oil, sank after several explosions weakened the hull.

"From the area where the tanker sank, a sea current is heading to the north, limiting the chances of the oil slick reaching Japanese coasts," the official at the environment ministry said.

The Japan Coast Guard said on Monday that oil had spread over an area 13 km (8.1 miles) long and 11 km (6.8 miles) wide, although it said the slick was shrinking as patrol boats battled to contain it.

A spokesman at the Japan Coast Guard added on Tuesday that it was carefully monitoring the oil slick in case weather conditions changed the spill's direction.

Experts worry the sinking of the Sanchi will likely expel the remaining condensate and the tanker's bunker fuel, or the heavy fuel oil that powers a ship's engines, contaminating the surrounding waters.

Bunker fuel is the dirtiest kind of oil, extremely toxic when spilled, though less explosive than condensate.

The Coast Guard spokesman said it had not identified what kind of oil was contained in the slick.

(Reporting by Yuka Obayashi; Editing by Joseph Radford)

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Reuters