A major search operation is under way for three people still missing after a deadly building collapse at a power station.
One person was killed and five people are in hospital after a concrete and steel structure at the derelict Didcot A site came down as contractors prepared it for demolition.
Specialist search and rescue teams, including sniffer dogs, have been involved in the search at the “challenging” site in Oxfordshire, deputy chief fire officer Nathan Travis said.
He said: “The building is potentially 10 storeys high, half of that building has collapsed, so you have got a rubble pile which is approximately 20 to 30ft deep at the moment.
“The search will be considerable due to the instability of the site, we expect the search to continue throughout the night and possibly into the coming days.”
Some 50 people were treated for dust inhalation after the collapse, which was declared soon after emergency services were called at 4pm on Tuesday.
Witnesses described hearing a “massive explosion” before a huge dust cloud rose up, making it seem “like the world had ended”.
Didcot A opened in 1970 as a coal-fired power station and was later converted so it could also generate power from natural gas.
It ceased generation in March 2013 and hundreds gathered to watch when three of its enormous cooling towers were blown up in July 2014 after dominating the town”s skyline for more than four decades.
According to the RWE npower website the total demolition of the site is expected to be complete by the end of this year.
An npower spokeswoman said: “We can confirm that shortly after 4pm this afternoon part of the boiler house at our former Didcot A power station site in Oxfordshire collapsed while an external demolition contractor was working in it.
“Our thoughts are with the families of all those involved in this tragedy.”