A fire investigator is trying to establish why a mobile home was destroyed by a blaze at Russell's Top 10 Holiday Park today.

Russell fire chief Jake Miller said the alarm was raised about 11.15am. Two volunteer crews saved a nearby workshop shed but the trailer home was razed.

No was injured in the fire, he said.

It was unclear what had caused the blaze so a fire investigator was due to inspect the remains this afternoon. An electrical fault is one of the possibilities being considered.

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It is thought the mobile home served as accommodation for campground staff.

At the height of the blaze, about 11.30am, a pall of black smoke could be seen over the town from as far away as the Waitangi Golf Course.