Bedfordshire Fire and Rescue Service rushed to the scene at 12.35pm today to reports of a fire at a polystyrene factory, which then spread to three buildings in total.
At the height of the fire there were more than 60 firefighters working to contain the fire, however, this has now been scaled back to around 30 firefighters.
Fortunately no-one was injured in the incident.
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Area commander Andy Peckham said: “We’re continuing to tackle a large fire and we expect to be on scene for a number of hours yet.
”Road closures remain in place so I would advise motorists to avoid the area and as there is still a great deal of smoke coming from the fire, we are continuing to advise residents to keep their windows closed.
“Our firefighters have worked incredibly hard to contain the fire so I would like to say a big thank you to them, as well as our neighbouring fire services who sent resource to assist us.
“A full fire investigation will be launched once the fire has been fully extinguished.”
Police closed a number of roads in the area while firefighter dealt with the incident, including the A6 at Milton Ernest.
Eyewitnesses spotted 100ft flames from more than five miles away in Stevington.
One said: "We can see small explosions and it seemed it looked like was spreading.”