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Footage has emerged of the moment an explosion hits firefighters tackling a burning industrial waste factory in Spain.
The CCTV images show those trying to fight the blaze arriving at the scene just moments before the blast.
People are then seen running from the building as firefighters stumble around in confusion moments after flames engulf the scene.
Thirty people were injured in the incident in the town of Arganda del Rey, about 10 miles (15km) outside Madrid, on 4 May.
Up to 18 firetrucks were sent to the blaze. Seconds after the first explosion there was a second that could be heard up to 20 kilometers away, creating a conflagration within the warehouse, catching several employees and emergency workers unaware: 35 people were injured, three of them seriously.
The waste management plant specialized in treating solvents.
Three people sustained burns to more than 30% of their bodies and were rushed to nearby hospitals, where they remain in a serious condition. Other people were treated for cuts and for smoke inhalation injuries.