It said some of the gas - which is used in the site's cooling systems - may have turned into liquid as the fire service used water to prevent it dispersing.
The group of five children, all aged under 12, were told to leave the water and warned by the fire service that flood water can hide dangerous hazards.
South Tyrone Hospital has been relying on the NI Fire Service and bottled water supplies.
John Spangenberg, production manager of Columbia Restoration, a fire and water restoration service in Jessup, Md.
The fire has been monitored by the fire service which said using water to put it out would create a giant ash plume.
The fire is being monitored by the fire service who say using water to put it out would create a giant ash plume.
Merseyside Fire and Rescue Service said the water was up to 50cms (1.6ft) high at its deepest.
An additional pump lowered into the mine by the fire service has helped reduce the water levels.
Coastguard officers attended to the man while a specialist fire service mud rescue team used water lances to free him.
Staffordshire Fire Service said it was pumping water from the A34 into a nearby culvert on the advice of the Environment Agency.
Gloucestershire Fire and Rescue Service is also visiting villages left isolated by flood water such as Deerhurst, Apperley, Tirley, Corse Lawn, Ashleworth, Sandhurst and Maisemore.
Some properties had up to 3ft (0.9m) of flood water in them, Devon and Somerset Fire and Rescue Service said.
North Yorkshire Fire and Rescue Service service said two cars had been caught in flood water in Cattall, but the occupants had managed to get to safety.
Hereford and Worcester Fire and Rescue Service is urging people to stay safe by staying off frozen water.
In Devon and Somerset, the fire service was called to 18 rescues of people in vehicles caught in flood water.
The prosecution said the fire service had many systemic failings, including the distribution of information about buildings and water supplies and also the training of firefighters.
Officers were assisted by the Swaledale Mountain Rescue Team, North Yorkshire Fire and Rescue Service and an RAF air support unit in their search of the water.
An operation to prevent water from flooding a hospital has been successful, North Yorkshire Fire and Rescue Service said.
Some residents in villages in the Tewkesbury area of Gloucestershire who were cut off by flood water were given the option of being taken to safer areas but the fire service said most were choosing to stay at home.
In the plan, HIFRS said water used in fire fighting had been excluded because it was a basic requirement for service delivery.
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Tayside Fire and Rescue Service said a van driver had to be rescued after his vehicle got stuck in water covering a stretch of about 100m of carriageway.
He adds that teams from the army, the fire service and border guards had been drilling holes through concrete walls and pushing through oxygen cylinders and water bottles in an attempt to keep those trapped alive until they could be freed.
The fire service said it was called to Strefford to reports of a man "trapped in fast flowing flood water who had attempted to cross a ford".
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