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Six people hurt in gas explosion Seven men hurt in gas explosion
(40 minutes later)
A gas canister has exploded at a warehouse, leaving six people injured - one in a critical condition and another unaccounted for. A gas canister has exploded at a warehouse, leaving seven men injured - one in a critical condition and another unaccounted for.
Emergency crews were called to the site at the Mundells, Welwyn Garden City, Hertfordshire, at 1500 GMT.Emergency crews were called to the site at the Mundells, Welwyn Garden City, Hertfordshire, at 1500 GMT.
Six people, one with life-threatening injuries, were taken to the Queen Elizabeth II Hospital in the city.Six people, one with life-threatening injuries, were taken to the Queen Elizabeth II Hospital in the city.
Another person is believed to be unaccounted for. Crews are searching the building. Another injured man did not need hospital treatment. A further person is believed to be unaccounted for.
Police and fire crews are searching the building.
A Hertfordshire Fire Service spokesman said 10 crews were tackling the fire and there are gas canisters inside.A Hertfordshire Fire Service spokesman said 10 crews were tackling the fire and there are gas canisters inside.
The Mundell one-way system has been closed. 'Building intact'
Hertfordshire Police said one of the people taken to hospital was seriously injured and four had minor injuries.Hertfordshire Police said one of the people taken to hospital was seriously injured and four had minor injuries.
A police spokesperson said that at this stage they "could not confirm whether there had been any fatalities". A police spokeswoman said that at this stage they "could not confirm whether there had been any fatalities".

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She added: "The building itself has sustained some damage but remains largely intact which enables the search to be continued by police officers.
"The Health and Safety Executive are aware of the incident and are monitoring the situation."
She added they would remain at the scene overnight carrying out forensic tests and a building search.
Roads are now open around the area and traffic is moving.

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