A timber cargo fire on a German bulker has been "largely extinguished" after the blaze broke out off Sweden on Saturday.

This is according to shipowner NSC Holding, which added that an inspection by experts will take place on the 32,000-dwt handysize Almirante Storni (built 2012) on Monday.

This will be done to detect any remaining "fire nests," NSC said.

"The crew are not in danger. The safety of the crew is kept under continuous review," the company said.

NSC added cooperation with local Swedish authorities had been at a high professional level, and the next steps will continue with this close cooperation.

"There is no risk to the environment," the company said.

NSC thanked all those assisting the company with the ongoing response.

The Swedish Civil Contingencies Agency (MSB) earlier said it had sent two helicopters to the scene off Gothenburg, while the coastguard was also involved in firefighting.

MSB said the vessel itself was not burning, but the fire had proved difficult to extinguish.

"The ship contains large amounts of fuel and MSB has started preparations to be able to support with resources in case of a potential leak," the agency added.

Crew not evacuated

The crew of 17 had not been evacuated from the ship, news agency TT reported.

The Expressen daily said the blaze began at 1330 GMT on Saturday.

"We are now continuing with full force to maintain the situation and be able to fight the fire," said Fredrik Tyren, the coastguard's rescue leader.

A Nato ship and a Danish patrol boat were also at the scene.

"When we talked to the captain on Sunday, he was clear that he did not want to evacuate," coastguard spokesman Mattias Lindholm told Expressen.

"There is no captain who abandons his ship like that. This is their workplace. Only the captain can decide on a possible evacuation," he added.

Fuel to be lightered

Preparations have been made to lighter fuel from the bulker, the coastguard said.

NSC earlier told Swedish media it had been in contact with the master, but the cause of the incident is not yet clear.

The vessel had arrived at anchorage outside Gothenburg on 4 December, from Ljusne in Sweden.

The Almirante Storni has insurance from the North P&I Club.