There has been a suspicious building fire in Warkworth tonight.

Northern FIre Communications' shift manager Megan Ruru said about 20 firefighters were called to a fire in a building on Gumfield Dr about 9.40pm.

The fire had engulfed the 200sq m building, as well as surrounding grass.

She did not know if the building was a home or business, but no one was believed to be inside.

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Warkworth Volunteer Fire Brigade posted on their Facebook page that the fire occurred at a "derelict house".

Call #50 21/02/17 21.40 Derelict House On Fire, Warkworth.

Posted by Warkworth Volunteer Fire Brigade on Tuesday, 21 February 2017

The fire was suspicious and a a fire investigator was on the way to the scene, Ruru said.