Swire's China Navigation Company (CNCo) has revealed a second round of "smouldering" on a coal carrier in New Zealand.

The 40,000-dwt bulker Liangchow (built 2015) hit the headlines on Monday when reports emerged of a smoking cargo on board at the port of Auckland.

Fire crews spent six hours dampening 1,000 tonnes of coal on the vessel, the Stuff website reported.