A housebus and sand-blasting shed were extensively damaged by fire in Marlborough last night.

Southern Fire shift manager Brent Dunn said five crews attended the blaze at Sheffield St, south of Blenheim, after a passerby raised the alarm at 1.50am.

The housebus and shed were well ablaze when firefighters from Blenheim and Seddon arrived.

No one was injured in the blaze.

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Dunn said the cause of the fire was unknown and fire investigators would return to the scene today.