One person has been killed in an explosion at a defence contractor close to the Army Air Corps training base at Middle Wallop in Hampshire.
The incident happened at Wallop Defence Systems Ltd near Andover on Monday afternoon, according to police.
It is believed that an oven exploded at the factory which produces explosive flares for the army.
The site was evacuated over fears that other ovens could explode. Roads were also closed near the explosion.
A Hampshire police spokesman said four other people suffered minor injuries in the incident and the resulting fire is now out.
A spokesman for Hampshire Fire Service said: "Part of the building has been completely demolished and there's debris spread over the area of a football pitch.
"Apparently there was a fire ball and a plume of smoke which quickly almost extinguished itself."