We're winding down our live coverage on the Didcot Power Station collapse for now.

You can follow the latest developments overnight on the BBC news website.

We will be back with live coverage at 06:00 tomorrow as the search operation continues.

Image source, Robbie Girling

Deputy fire officer Nathan Travis stressed the collapse of the 300m long 10-storey high building was not caused by a terrorist incident.

He said the search would be considerable "due to the instability of the site" and that sniffer dogs would be used to carry out a systematic search of the 20-30ft deep rubble pile.

About 60 firefighters were on site at the busiest point. There is a 100m cordon in place but no roads are currently closed.

The Health and Safety Executive has been informed and will conduct an investigation supported by Thames Valley Police.

It seems there's a bit of confusion over the number of injuries from the collapse at Didcot Power Station.

The fire service has reported four people hurt but John Radcliffe Hospital said it is treating five men.

"Four of the men are in a stable and non-life threatening condition, while one man is in a serious but not life-threatening condition," it said.

The fire officer also confirmed there were no explosives in the building at the time.

He said the workers were prepping the area for a demolition.

According to Nathan Travis, deputy chief fire officer of Oxfordshire Fire and Rescue, three people are still missing following the Didcot A Power Station collapse. 

He said the search was expected to continue through the night and into the coming days.

The fire officer said four people had been taken to John Radcliffe Hospital - two with serious injuries and two with minor injuries.

It was initially reported five people had been injured.

Nathan Travis, deputy chief fire officer of Oxfordshire Fire and Rescue, said more than 50 people have been treated at the site for dust inhalation.

A senior spokesman for RWE npower said it was a partial collapse and not an explosion that caused a section of the building to come down.

Former Didcot power station worker Nigel Brady has taken pictures of the site before and after this afternoon's collapse.

Image source, Nigel Brady

He worked there from 1989 to 2013, and was on staff when the last generator was taken off the grid. 

"Didcot A has been a huge part of my life for 28 years," he said.

Nigel Brady, who lives in Grove, Oxfordshire, worked at the power station for 28 years and now works opposite it.

"I'd seen the guys working in there today. I'm shocked by the events, that something has gone so wrong.

"My understanding is it's a pure collapse, this is just hearsay from social media, but my friends don't believe it was an explosion."

We're expecting a statement imminently from deputy chief fire officer of Oxfordshire fire service Nathan Travis.

It is unclear if there have been any further developments.

Bill Stammers, who was on Great Western Park at the time of the collapse, told BBC Radio Oxford: "I heard this rumbling, and wondered what on earth was that?

"It wasn't like the 'crump' when they dropped the towers [in 2014]. I got up to see what it was, looked out... and half the turbine hall had dropped."

Coleman Demolition, which was working to decommission Didcot Power Station at the time of the collapse, has just given an update on Twitter. 

Area manager Mat Carlile, from Thames Valley Fire Control Service, said search and rescues teams will work into the night to try and find survivors.

Oxfordshire County Council has advised residents to remain inside keeping doors and windows closed.

Helicopter footage has revealed the scale of the collapse at Didcot Power Station.

Rescue teams are faced with a huge task to locate the missing workers.

Image source, bbc

Oxfordshire chief fire officer Dave Etheridge said a search and rescue team from Buckinghamshire and Milton Keynes fire service was helping with the operation. 

He said there was no risk of any further building collapse, or risk to the public from the dust cloud.

As the building was scheduled for demolition in 10 days time, all hazardous materials had been moved out, he explained.

Chief fire officer Dave Etheridge described the collapse as a "very severe incident" which left one dead, five injured and three unaccounted for.

He expressed "absolute sympathy and deep thoughts to all the families involved". 

He added: "We are doing our very best to secure the return of their loved ones as soon as we can."

Oxfordshire fire and rescue says three people are still unaccounted for after part of Didcot A Power Station collapsed.

A GMB union official said workers at Didcot Power Station were preparing two boilers for their demolition in the coming weeks which "led to the collapse of a building". 

He did not believe there had been an explosion, he added.