A fire that badly damaged a vacant house in Napier on Thursday morning has been deemed suspicious.

Police are investigating the fire which broke out about 5am on Tom Parker Ave in Marewa.

Two fire engines from the nearby Napier Fire Station attended the blaze.

The damage appeared to be largely internal and also caused some windows to blow out.

A Fire and Emergency NZ spokeswoman said there were two fires in two rooms.

The fire did not spread to other buildings and no one was injured.

Police and a fire investigator were at the scene later in the morning.

Neighbours spoken to by Hawke’s Bay Today said a tenant moved out of the house last weekend, and it was vacant when the fire happened, which police confirmed.

Police said a scene guard was put in place after the early morning blaze.

The house backs onto Marewa Park.