Williams' celebrations after Pastor Maldonado's Spanish Grand Prix victory were wrecked soon after by a fire that broke out in the team's garage.

A Caterham spokesperson confirmed four personnel were injured and taken to the medical centre at Barcelona's Circuit de Catalunya. One had a minor hand injury and three had respiratory issues. A Force India employee was taken to hospital to receive treatment for smoke inhalation. An electrical fault with the fuel rig is believed to be the cause .

At the time the blaze started, around 90 minutes after the race had concluded, Sir Frank Williams was delivering a speech to his team. It is understood an explosion occurred, sending scores of people running into the pitlane.

The blaze rapidly took hold, gutting the garage which included Bruno Senna's car after it had been involved in an accident in the race with Mercedes' Michael Schumacher.

Williams mechanics were joined in their battle to beat the fire by personnel from other teams, notably Caterham and Force India in the neighbouring garages, taking 20 minutes to bring it under control.