Meanwhile, firefighters are also investigating the cause of a huge fire at a nursery in Smallford, near St Albans, on Sunday.
Japan Airlines confirmed the cause of the fire in a news release.
Det Supt Singh said the cause of the fire had not yet been established and a joint investigation by the police and fire service was continuing.
It could take up to a year to determine the cause of the fire, however, because of the amount of work involved.
The cause of the fire is not yet known and a scaled-down presence was expected at the site for some time as damping down continued.
Harriet Harman, the area's MP, said there would have to be a thorough investigation into the cause of the fire and whether the prevention was adequate.
The initial cause of the fire can be something as simple as a discarded cigarette butt or a charcoal barbecue left unattended on a balcony.
If you asked my wife, she would say "yes" because for awhile, during that minute or so after the pop, she thought that the explosion and fire might cause a hole in the side of the plane that would decompress it.
He added that a full investigation was under way to establish the cause of the fire.
BBC: Firefighters tackle blaze at Stirling Superglass factory
The expert said a degraded capacitor, a circuitry component used in various electrical appliances, was the likely cause of the fire.
The cause of the blaze is not yet known and will be subject to a joint investigation by Strathclyde Fire and Rescue and Strathclyde Police.
Because of his extraordinary knowledge of fire and explosives, companies in civil litigation frequently sought his help in determining the cause of a blaze.
"We advised that there were some concerns with some of the stands that they wanted to use, and alongside the carol singers this may cause a risk to fire escape procedures, " she said.
BBC: NEWS | UK | England | West Yorkshire | Carols ban 'a misunderstanding'
Limo Stop, the firm that operated the vehicle, issued a statement saying it would "do everything possible to investigate and assist authorities in determining the cause of this fire in order to bring forth answers and provide closure to victims and their families".
Used as a fire retardant in buildings, asbestos fibres can cause the fatal lung cancer mesothelioma, and the scarring of the lungs, known as asbestosis.
The results will cause any pork lover to swoon, but the prospect of procuring and boning a whole pig and then wrangling it over a fire pit in my small and densely wooded yard seemed beyond impossible in this lifetime.
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