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Firefighters were called to the Pure Fuels plant in Old Great North Road shortly after 1.45pm this afternoon.

In April three people were injured at the site after a chemical spillage, said to be of sulphuric acid, while the company was issued an enforcement notice from the Health and Safety Executive (HSE) following an explosion in November which left two people injured.

Pure Fuels had fully complied with the notice by the end of January.

Firefighters at the plant. Photo: Terry Harris

On the latest incident, a Cambridgeshire Fire and Rescue Service spokeswoman said: “The fire was extinguished when crews arrived at the scene.

“Crews and officers will be investigating the site to see how the fire was caused.”

Tom Lasica, managing director at the company, said: “There was a minor incident on site which was dealt with promptly and effectively with our own fire safety equipment and by our members of staff following our safety procedures.

“A member of the public called the fire services, however, their services were not required as the issue had been dealt with by site personnel.”

The process for bio-fuel production turns used cooking oils into other fuels which can be used to power lorries and cars as well as generate electricity.

Fire at Stibbington bio-fuel plant previously hit by explosion and chemical spill