Emergency services have been called to a fire at the Spice Guru restaurant on Victoria Ave in Whanganui.
Fire and Emergency NZ crews were called to the scene around 2.35pm on Wednesday.
Police Sergeant Colin Wright said the fire was in the kitchen and Fire and Emergency crews were investigating.
Victoria Ave was blocked between Taupō Quay and Ridgway St.
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Fire and Emergency senior station officer Aaron Summerhays said he believed the fire had started in the kitchen, but wasn't sure until a proper investigation was underway.
Three crews from the Whanganui Brigade were in the building extinguishing the fire.
Neighbouring businesses were cordoned off just in case the fire spread.
He said Victoria Ave would be closed until the investigation had wrapped up.