Fire fighters are battling what's estimated to be a 50-hectare vegetation blaze in the Tongariro Forest Park

Crews were called just after 3 this afternoon.

Six brigades, a command unit, and four helicopters are at the scene or on their way.

Fire and Emergency says trampers in the Mangatepopo Hut are being asked to stay put.

State Highway 47 has been closed near the State Highway 48 junction, with a large build of traffic reported.

Travellers are being asked to avoid the area or delay travel until detour information is available.