The Health and Safety Executive (HSE) said at the time that Steven's death was "entirely preventable".
Mr Whiting's death was an "entirely preventable tragedy", the Health and Safety Executive (HSE) said.
The Health and Safety Executive said it was aware of the incident and was making inquiries.
Mike Walters, from the Health and Safety Executive (HSE), said the watchdog may take further action.
Railtrack, train operating companies and the Health and Safety Executive have to look at themselves.
Health and Safety Executive inspectors are heading to the site and will be investigating alongside police.
An agreement on the extension was agreed with the Health and Safety Executive (HSE).
An investigation is being carried out into the incident by police and the Health and Safety Executive.
In February the board was issued with two improvement notices by the Health and Safety Executive.
The Health and Safety Executive (HSE) is investigating the incident, which happened when the park was closed.
The Health and Safety Executive has produced new guidelines on what it calls "work-based upper limb disorders".
The inquest also took evidence from members of the Health and Safety Executive of Northern Ireland (HSENI).
The Health Protection Agency and the Health and Safety Executive have been informed of the latest case.
The Health and Safety Executive has commissioned a British study of MCS from the Institute of Medicine.
BBC: By BBC News Online's Environment Correspondent Alex Kirby
Major concerns were highlighted at 61 of 215 sites recently inspected by the Health and Safety Executive (HSE).
At Leicester Magistrates' Court, the Health and Safety Executive (HSE) said the tractor had a faulty starter motor.
The Health and Safety Executive (HSE) is prosecuting Basildon Hospital under the Health and Safety at Work Act.
The Health and Safety Executive (HSE) said it was "a very serious incident".
More than 400 sites were visited by Health and Safety Executive (HSE) inspectors between 18 February and 15 March.
BBC: HSE fails quarter of London building site safety checks
He said the Health and Safety Executive had been informed about the incident.
The Health and Safety Executive (HSE) has said no-one can be blamed for gas igniting from a fractured pipe.
The Health and Safety Executive (HSE) carried out tests which indicated the risk to pupils and teachers was low.
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Surrey Police is investigating and the Health and Safety Executive - which investigates work-based accidents - has been notified.
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Inquiries are under way by both the Health and Safety Executive and police.
The Health and Safety Executive (HSE) has prosecuted Basildon University Hospital under the Health and Safety at Work Act.
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The police and the Health and Safety Executive are also investigating the incident.
But the Health and Safety Executive (HSE) have said that they may never know the true cause of the explosion.
But in February this year a Health and Safety Executive report said the site was essentially free of asbestos contamination.
The Health and Safety Executive said it was aware of the incident and inspectors were on site helping the police.
The couple's family said they were "devastated" and have welcomed a Health and Safety Executive (HSE) investigation into the incident.
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