Two people are being treated for burns following a small explosion in a van in Franz Josef tonight.

Fire crews and St John staff have been called to a camp ground on Doherty Creek Rd.

The Fire Service said it had responded to a small explosion to a van.

A southern ambulance communications spokesman said they received a call to the site about 8pm.

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They were told by the Fire Service that two people had suffered minor burns in some sort of "gas fire'' inside a van.

The spokesman said just before 8.30pm that it appeared to be a couple involved in the accident.

The woman had suffered burns on her legs, while a man had suffered very minor burns, he said.

Both were expected to be treated by staff at the scene.

The circumstances of the fire are not yet known.