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Northern Ireland Water is one of the biggest landowners in the mountains and purchased 9,000 acres in the 1900s to secure a supply of drinking water for the growing city of Belfast.

They have argued that the main beneficiaries would be development interests in Southern California and agricultural landowners in the southern San Joaquin Valley.

Green GEN Cymru confirmed it had applied for court warrants to access private land by force after landowners refused its initial applications.

Dr Williamson said the lack of a relationship between the landowners and the community could be "detrimental to a good outcome" in the sale.

In a statement, North Wales Fire and Rescue Service reminded landowners carrying out controlled burns to do so responsibly and to always inform fire officers in advance.