A man who died in an explosion in a flat has been named by police - as gas was ruled out as the cause.
Graham Green, 50, died in the blast in Alloa, Clackmannanshire, on Sunday evening.
Horrifying footage, obtained by MailOnline, shows a huge fireball bursting from the building where Mr Green was in a flat at around 6pm.
Part of the roof of the property in Kellie Place was ripped off by the blast and a gaping hole was left in the first floor of the building.
Mr Greens next of kin have been informed although formal identification has not yet taken place.
Graham Green, 50, (pictured) died in the blast in Alloa, Clackmannanshire, on Sunday evening
A family tribute posted on Facebook said: It is with great sadness we announce the passing of Graham Green (Greenie)
A loud blast can be heard in the horrifying footage, obtained by MailOnline, before a huge fireball can be seen bursting from the building in Kellie Place, Alloa, Clackmannanshire
Three other people from the same building - a 49-year-old woman and two men aged 19 and 72 - were treated at Forth Valley Hospital in Falkirk.
The death is currently being treated as unexplained and inquiries into the cause of the incident remain ongoing.
A family tribute posted on Facebook said: It is with great sadness we announce the passing of Graham Green (Greenie).
We want to thank all of the emergency services involved during this tragic event.
The family and I would also like to thank everyone for their overwhelming support and condolences at this difficult time.
A spokesperson for gas distribution company SGN said: Our thoughts remain with everyone affected by the incident which took place on Sunday evening.
After thorough investigation, we can confirm that the incident is not related to our gas network.
Police Scotland and the HSE (Health and Safety Executive) are continuing their investigations into the cause.
Flames can be seen tearing through the building and the roof collapsed in Kellie Place, Alloa, Clackmannanshire
Harrowing images show the aftermath of a huge house explosion in Kellie Place, Alloa, Scotland, that killed one man and hospitalised three people
An aerial photo shows the aftermath of the huge explosion. Police Scotland is still working to establish the full circumstances of what happened
Police Scotland Chief Inspector Kat Thompson, area commander, said: Our thoughts remain with the family and friends of Graham and all those affected at this difficult time.
Our inquiries, alongside partner agencies, to establish the full circumstances of what happened remain ongoing.
A police presence will remain in the area and I would like to thank the local community for their understanding and support.
Labour MP Brian Leishman wrote on social media at the time: Absolutely awful news from Alloa, my thoughts go to the family and friends of everyone connected to the tragic incident that happened in Kellie Place.
Thank you to the first responders and the emergency services.
An HSE spokesperson said: We continue to assist Police Scotland to establish the cause of the explosion that resulted in the death of Graham Green. Our thoughts are with his friends and family at this time.
In the video footage,, scores of terrified witnesses are seen rushing towards the building gasping Oh my god with one woman abandoning her car as plumes of grey smoke engulf the home.
Passersby and staff and diners from a nearby restaurant rushed to the aid of residents trapped inside the flats.
A SGN gas company van is parked up behind a police cordon with a man in a white helmet and high-vis jacket seen working behind a metal fence
Neighbours were evacuated from their homes and spent the night in alternative accommodation with the local town hall acting as a makeshift respite centre
Three other people from the same block of flats were taken to Forth Valley Royal Infirmary for treatment to minor injuries (pictured: Emergency services at the scene on Sunday night)
Fire & Rescue in attendance at Kellie Place in Alloa on Sunday evening following an explosion in a property in the street
One man was heard screaming for help and another emerged from the building caked in soot after the blast.
Restaurant worker Garry Singh, 28, was the first to arrive at the explosion site and described hearing people screaming for help with others in floods of tears.
He ran outside from the Alba restaurant and saw that the buildings roof was missing.
People were shaken. There was one girl, it was heartbreaking to see, she was crying. It was hard to see, he said.
There was a man screaming help from one of the buildings. By that time the fire brigade were there so you take a step back.
It was a difficult thing to see. Its right on your doorstep on a busy Sunday evening in the restaurant and its the last thing you expect. It was crazy.
Terrified neighbour Rosie Adamson ran to her window when she heard the loud bang and saw a giant blaze.
I just heard this big boom - my doors shook, she said. I thought World War Three had started.
There was this big boom, and then I ran to the window and saw the flames and the smoke.
Investigation: Firefighters at the scene of the explosion in Alloa on Sunday
An engineer climbs over a metal railing near to where piles of rubble lie on the floor in front of a home in Alloa
Police officers guarding the scene on Monday with white and blue tape blocking off the road
Prayers were being held at Alloa Ludgate Church on Monday morning. Writing on its Facebook page, the church said: Please remember in your prayers those who have been affected by this sad event, and all those living nearby, who will have been shocked and scared by all that was happening around, also with the high presence of emergency response vehicles.
Clackmannanshire Council said a rest centre for those affected was set up at Alloa town hall while gas and electrical work was undertaken onsite, with those affected all managing to find shelter with friends and family overnight.
Alloa Town Hall was opened on Sunday night as a respite centre for occupants of the other flats within the address while gas and electrical work was undertaken.
Police Scotland said if they could not return to their homes, residents would be supported with alternative accommodation for the night.