Two cars have been set ablaze in Manurewa in a suspected arson.

A witness said two cars were on fire on Great South Rd, just south of Browns Rd.

Northern fire communications shift manager Colin Underdown said both cars had been completely on fire but there were no reported injuries.

He said fire officers were checking the area and have asked for the power to be turned off for safety reasons.

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Police have been called.

"There's been no crash - they're just involved in a fire. We believe it is suspicious, we've got police responding," he said.

Fire officers were called at 8.24pm.