Isle of Wight fire crews, from Cowes and Ryde, are among those at Pound Lane near Calbourne.

UPDATE and PHOTOS: Warning after Isle of Wight fires in Brighstone and Calbourne

What was initially feared to be a barn fire was is actually a horsebox on fire in a wooded area, said Hampshire and Isle of Wight Fire and Rescue Service.

Four fire engines and a water carrier are currently on the scene.

The fire has also affected a nearby wooded area and field.

Firefighers are using hose reels and beaters to tackle the blaze, after the were called out at about 4.30pm.