A man is fighting for his life after a huge fire broke out near what is thought to be a weapons systems factory, with hundreds of emergency personnel on the scene.
Two people were taken to hospital - with police confirming one is in a critical condition.
Locals have been told to keep windows and doors shut after fire crews were called out to Erewash, Derbyshire, late last night.
Firefighters from Derbyshire Fire and Rescue Service were sent to the scene on Wilne Road in the village of Draycott at just before 9.15pm.
The fire is understood to have broken out at pyrotechnics firm PW Defence, known locally as the "fireworks factory".
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DFRS has not released any further information on the incident at this time.
In a tweet posted just before 11pm on Friday, it wrote: "Firefighters are currently dealing with an incident on Wilne Road in #Draycott Local residents are advised to keep their windows and doors closed while we deal with the incident.
"No further information is available at present."
The factory is understood to create CS gas and grenades.
Emergency workers in white forensics suits have been pictured.
A witness said he believed there had been an explosion due to the colour of the smoke and the smell of gunpowder and sulphur in the air.
Chemring Countermeasures UK sold the site in 2019.
An employee of PW Defence Ltd told the Mirror there is currently no staff on site and no comment would be released until next week.
A police spokesperson said: "A man was taken to hospital in a critical condition."
He added that "primacy" for the investigation now lies with the fire service and the government's Health and Safety Executive (HSE).
"Primacy for the investigation will lie with DFRS and the HSE from now, so any further updates will come from them.
On Saturday morning a fire spokesman said: "One fire crew remains on scene damping down and checking for hot spots at the scene of a fire on Wilne Road, Draycott.
"A joint fire investigation with Derbyshire Constabulary will commence later this morning."
A East Midlands Ambulance Service spokesperson said: "We were called at 21.05 hours on 20 January to Draycott in Derbyshire. The caller reported a fire in a building.
"We sent our Hazardous Area Response Team, four ambulances, two fast response cars and the Air Ambulance.
"Two patients were taken to the Queen’s Medical Centre, in Nottingham, by ambulance."
The Ministry of Defence said it did not wish to comment at this time.
