Traffic has been diverted, three helicopters have been placed on standby and at least seven appliances dispatched to a large fire on both sides of State Highway 6 in Cromwell.
A Fire and Emergency New Zealand spokesman said an appliance from Cromwell and a tanker from Tarras were the first to respond to the fire, which was reported near the intersection of SH6 and SH8B about 2.05pm today.
More calls were received while they were responding and the crew from Cromwell requested a third alarm to be activated due to the dry conditions.
Appliances from Clyde, Alexander, Luggate and Dunstan stations were sent, along with a command unit from Dunedin.