We're told it was started deliberately.
A Timeline Of The Clutha Tragedy
Here is a timeline of events surrounding the Clutha helicopter crash:
:: A Police Scotland helicopter, a Eurocopter EC135, crashes on to the roof of the Clutha pub in Glasgow's Clydeside at about 10.25pm. Emergency services declare it a major incident.
November 30, St Andrew's Day
:: Then First Minister Alex Salmond warns: "We must all prepare ourselves for the likelihood of fatalities.''
:: Eight people are later confirmed dead.
:: Thirty-two people are taken to hospitals across Glasgow.
:: Police name a body recovered from the scene as Gary Arthur. The operation to recover the remaining bodies continues.
:: Senior public figures, including the Queen and Prime Minister David Cameron, express their condolences to those caught up in the tragedy.
:: Hundreds attend a cathedral service to remember those affected by the tragedy and express their gratitude to the emergency services.
:: The three people who died on board the helicopter - pilot David Traill, police officer Kirsty Nelis and police officer Tony Collins - are formally named.
:: Nine people are now confirmed to have died.
:: The remains of the aircraft are removed from the building.
:: Air crash investigators reveal that no mayday call was made before the aircraft crashed.
:: A minute's silence is held in Glasgow's George Square to mark the tragedy.
:: The search-and-recovery operation at the site concludes.
:: All nine fatalities have now been named by police.
:: Deputy Prime Minister Nick Clegg visits the scene. Mr Salmond visits the City Chambers to sign a book of condolence.
:: Comedian and actor Billy Connolly visits the scene to lay a bouquet of flowers.
:: A fund to help bereaved relatives and survivors of the crash is opened by the city council.
:: It is announced that the bodies of those who died are being released to their families.
:: The Prince of Wales visits the site, signs the city's book of condolence and meets emergency workers.
:: The first of the funerals for those who died, captain David Traill, takes place at Glasgow University.
:: The funerals of pub customers Mark O'Prey and Gary Arthur are held.
:: The Air Accidents Investigation Branch (AAIB) reveals it has found no initial evidence of engine or gearbox failure in the helicopter.
:: The funerals of Pc Tony Collins and pub customer John McGarrigle take place.
:: The funeral of Pc Kirsty Nelis is held.
:: Mourners attend the funerals of crash victims Colin Gibson and Robert Jenkins.
:: A 10th person dies a fortnight after the crash. Joe Cusker had been receiving treatment in hospital but died at Glasgow Royal Infirmary.
:: The funeral of Samuel McGhee is held.
:: Helicopter manufacturer Eurocopter issues a worldwide safety alert after a fault was found in the model of aircraft that crashed.
:: The funeral of Joe Cusker takes place.
:: The RMT union steps up calls for a public inquiry into helicopter safety.
:: An interim air accident report by the AAIB finds that both engines failed on the helicopter.
:: A book of condolence signed by MPs after the crash is handed to the city by Commons Speaker John Bercow.
:: A benefit gig takes place at the Barrowlands venue for people affected by the crash.
:: A memorial service is held at St Andrew's Cathedral in Glasgow for the 10 who died.
:: The ska band playing in the Clutha at the time, Esperanza, tell The Big Issue they are haunted by what they saw.
:: A concert took place at the Barrowlands in Glasgow to launch the Clutha Trust, which aims to help disadvantaged young people.
William Burns posed as a postman.
Police and other emergency services were called to a property in Redburn, Bonhill, Alexandria, at about 12.30am on Tuesday.
Charities say the stage it's diagnosed is crucial.
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