St John said ambulance services were called to the event at 7.28pm and treated one person in a serious condition, with burns.
A fire investigator leaves the Moerewa meat processing plant after investigating the scene of the accident. Photo / John Stone
A rescue helicopter was sent to transfer the ijured person to Middlemore Hospital in Auckland.
A spokesman for the Auckland Westpac Rescue Helicopter said they were tasked to Bay of Islands Hospital, in Kawakawa, to assist with the urgent transportation of a male patient in his 30s suffering extensive burns to his body.
A reporter at the scene this morning said there were no visible signs of smoke or fire damage from the road in front of the plant.