Firefighters have been called back to a house fire after passers-by saw flames coming out from underneath the home.

Northern Fire Communications shift manager Jaron Phillips said the Tokoroa house first erupted in flames at about 10.20pm yesterday.

Firefighters required back-up from a further five fire appliances from Tokoroa and Putaruru.

The occupants of the home managed to escape unscathed.

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However, at about 7am today, firefighters were again called after the flames were spotted.

A fire safety officer is investigating the cause of the blaze.