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Firefighters were called to a suspicious blaze near an industrial estate.
Crews tackled a fire involving a large number of pallets at the Riverside Industrial Estate, Dartford.
They arrived at the scene at around 5.45am, along with Kent Police, and it is being treated as suspicious.
Three engines were used to extinguish the fire which was put out just before 6.30am.
It is near the same location where firefighters tackled a blaze at a coffee factory in October.
Police have been contacted for further information.