A 3,000-litre gas cylinder has been made safe after it began leaking when an oak tree fell on it.
More than 100 people - mostly children - were evacuated from the Colomendy outdoor education centre at Loggerheads in Denbighshire on Tuesday.
The evacuees, from two schools in Italy and London, spent the night at Howell's school near Denbigh.
The damaged tank was one of six at the centre which were being emptied by Calor Gas experts on Wednesday.
The incident occurred at about midday on Tuesday, and firefighters used a water jet to disperse the gas cloud. There were no injuries.
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