Lincolnshire Fire and Rescue
Businesses evacuated as raging building fire pours thick smoke onto A1
Video shows tall flames shooting out of the large building
Dozens of firefighters have been deployed to a large fire ripping through a large building on an industrial estate.
Eyewitnesses say nearby businesses have been evacuated at the site off the A1 and a column of smoke can be seen from several miles away.
Video footage obtained by Lincolnshire Live shows flames shooting out of the building as smoke churns out of the premises.
Unconfirmed reports suggest it is a chemical plant that has become engulfed in flames.
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Lincolnshire Fire and Rescue service has confirmed they are tackling the blaze on Tollemache Road in Grantham, which was reported at 3.29pm.
Nearby businesses have been evacuated and a number of fire engines are at the scene.
One nearby worker told Lincolnshire Live: "Five or six fire engines are here and more are needed."
He added that a nearby chemical plant had "gone up" and that the fire was serious.
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Onlookers are watching on as firefighters battle the blaze, according to the eyewitness.
The smoke has been described as visible in Great Ponton, three miles south of the fire.
According to the Grantham Journal, the fire has broken out at Specialised Chemicals Ltd.
Plumes of smoke have been sighted (Image: Wendy Benson)
Jessica Lavender, 25, who saw it while travelling along the A1, said: "There is slow traffic on both sides. It is especially slow around Great Ponton.
"There is smoke all over the road. It is a huge fire - there is smoke everywhere.
"The flames are going through the roof and it has got thicker and darker the further I have driven away.
"I don't think it is under control."
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Lincolnshire Fire and Rescue are urging all persons nearby to stay inside and keep their windows closed and doors closed.
A spokesman said: "We are in attendance at a large fire in Grantham. We are advising residents in the Tollemache road area to keep windows and doors closed."