Police said they now believed there was an electrical fault with the hob on Mrs Crown's cooker, but could not confirm whether they believed that started the fire or whether an accelerant was used.
Chilean authorities have indicated that Mapuche activists may have started the fire that killed the firefighters.
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Detectives said that they now know that the fire started in the back of the lounge, and are now confident that the family laptop is not amongst the debris from the fire.
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So far, investigators have eliminated the possibility that natural causes started the fire, but they haven't gone beyond that.
Mohammed Youssef, a pilot of another balloon which was in the air nearby at the time, told the Guardian newspaper that the fire started when it was 3m from the ground and was caused by a gas leak.
Most of the damage there was also from smoke and heat, suggesting that the fire had started farther down the hallway, and he headed that way, stepping over debris and ducking under insulation and wiring that hung down from the exposed ceiling.
Leicestershire Fire and Rescue Service has established that the fire started accidentally.
The emergency, as she and other passengers would learn, was a fire that started in the rear of Royal Caribbean's Grandeur of the Seas cruise ship about 2:50 a.m.
Most of the casualties were from a fire that started when motorcycles parked in the same compound were set ablaze by the explosion at 2:30 p.m. local time, he said.
Other survivors told investigators that one of the inmates started the fire by lighting fire to his bedding.
The court had previously heard that the fire which ignited the pushchair had been deliberately started by somebody holding a flame against it.
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When, this summer, I heard on the news that some Africans had died because a fire had started in the stairway of their rundown tenement, I had an idea.
Some of the company's 50 staff were evacuated from the site and 12 fire engines were called after the blaze that started at about 08:15 BST.
One sinister finding by investigators is that the fire seems to have started in two places and that there was a lot of combustible material lying about.
Witnesses said that a flare or firework lit by band members may have started the fire.
That was an electrical problem, or at least they feel that it was probably an electrical problem, and a fire started in the wiring.
Devon and Cornwall Police said the full circumstances surrounding how the fire started had still to be established, but added that no-one was being sought in connection with it.
He has already had to damp down a fire started when an unidentified aide told the Daily Telegraph that they understood Britain better than the White House because of a shared "Anglo-Saxon" heritage.
That means he should have started by having the operation, getting through rehab and starting to train hard - that way he would be on fire at the beginning of the season when everyone else is tired from touring.
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