More than 50 firefighters have been tackling a blaze at an old aircraft hanger on the former RAF Manby site in Lincolnshire this evening.
A 200 metre cordon has been put around the building after police said there was a danger of it collapsing.
Ten fire crews plus a hydraulic platform were used to fight the fire which broke out shortly after 5 o' clock. Four crews are still at the scene and are dampening down.
Eyewitnesses claim there was a series of explosions inside the hanger which it's understood is owned by Winchester Marine and is used to store diesel engines. The old RAF base, which is five miles east of Louth, closed in 1974 and is now used as a business park.
We spoke to Nick Davies from Lincolnshire Fire and Rescue and Steve Pratten from East Midlands Ambulance Service.