A tug boat has joined the efforts to put out a boat fire in the entrance to Marsden Pt marina near Whangarei.

Emergency services were called just after midday to what's believed to be a 40ft vessel on fire.

Northern Fire Communications shift manager Megan Haruru says people were removed from the boat earlier.

A Marsden Pt oil refinery rescue boat with firefighters on board has been trying to extinguish the fire.

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She says it appears extra resources such as pumps and hoses were needed and a tug boat has gone out to assist.