The Cumberland County coroner said a bullet had been left in the gun before Tuesday's shooting.
Coroner Ciaran McLoughlin said that two witnesses are to be recalled to clarify their evidence.
Instead his evidence was outlined to the coroner by a West Midlands police officer.
Mrs Gibson was asked by North Yorkshire Coroner, Rob Turnbull, if she had any questions.
The coroner heard early investigations revealed the cause was a failure in the roof support system.
Coroner Dewi Pritchard-Jones said Jade, who had been in the front seat, had suffered "horrendous" injuries.
Jade had "suffered serious injuries that led to her instant death", the coroner said.
Deputy assistant coroner David Osborne said Mrs Carter died after suffering a large bowel ischaemia.
Derby Coroner's Court heard Dr Hunter say "human decency" should persuade people to talk to detectives.
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After the jury's verdicts, coroner Michael Rose expressed his sympathy to the families of the dead.
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The coroner said there was no real way of knowing the motivation for the attack.
Once the inquiry is finished, the coroner's conclusions are expected in three to four weeks.
The coroner recorded he had died of natural causes at the home in February 2012.
Eleanor McGann, deputy coroner for Essex, opened and adjourned the inquest during a brief hearing.
The coroner heard how he had appeared depressed after being unemployed for 18 months.
"There was a continuous sequence of shortcomings, " said Christopher Woolley, Cardiff assistant deputy coroner.
The death is not being treated as suspicious and the coroner has been informed.
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Police described the residence as "extremely hot, " Coroner Stephen Nonn said in a written statement.
The Mod also said it would consider the coroner's findings in more detail before responding officially.
Tony Canavan said that all the recommendations made by the coroner would be taken on board.
The coroner, Dr Shirley Radcliffe, said it was likely she had an undiagnosed congenital heart problem.
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An inquest into the deaths will open on Tuesday at 09:00 BST at Barnet Coroner's Court.
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He is also trying to provide the coroner's office with his brother's dental records, he said.
Mr Horsley, coroner for Portsmouth and South East Hampshire, ruled the cause of death was bronchopneumonia.
Janine Prunty, the coroner's officer, confirmed Mr Berezovsky's daughter, Elizaveta Berezovskaya, formally identified the body.
She told the coroner she could tell she was dying by looking at her.
The coroner's decision provoked outrage among relatives of those whose deaths were to be scrutinised.
Someone back in economy class had died, and we had to wait for a coroner.
Peter Halford, who found the first inscribed ring, was in court to hear the coroner's judgement.
"He would have been well aware of the dangers involved in his sport, " the coroner said.
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