A document detailing full names, addresses, phone numbers and occupations of around 12,000 British National Party (BNP) members has been posted on the internet, in what the party's leader, Nick Griffin, branded "a disgraceful act of treachery".

The membership list for 2007 includes 21 members with addresses in Denbighshire, 39 in Flintshire, 29 in Gwynedd and 42 in Wrexham

Nationally it includes people in sensitive professions such as teaching, the prison service, the police, the armed forces and the church.

The Wrexham list includes members from across the county, including Rhos, Llay, Ponciau, New Broughton, Ruabon, Coedpoeth, Marchwiel, Acton and Acrefair.

British National Party members in Flintshire came from areas including Mostyn, Mancot, Mynydd Isa, Garden City, Flint, Holywell, Connah's Quay, Northop Hall, Bagillt, Greenfield, Northop, Pentre, Mold, Buckley, Treuddyn, Gronant, Sealand, Hope, Broughton, Saltney.

Many listed members in Flintshire are from rural areas, including Rhydymwyn, Gwespyr, Pantymwyn and Llanasa.

Elsewhere in North Wales BNP members include a forester from Denbigh and two entire families from Rhyl.

When contacted by the Evening Leader forester Steven Jones, 45, from Denbigh, was unaware his name and details had been exposed. "It's not an illegal organisation," he said.

"I am not trying to make excuses, I joined out of curiosity.

"I don't care. I have got black friends and neighbours whom I am close to and are some of the best people I know.

"It is a free country. I joined about the stance on immigration. I am not a racist, I am a nationalist."

Fellow British National Party member Brian Burton, from Bala, said: "I'm not at all concerned.

"I think it's quite obvious why I am a member of the BNP really.

"The other main parties are making a bad job of running the country."

The full national BNP member list also contains the names of children, who are listed under family memberships, and fears have been raised by Alyn and Deeside AM Carl Sargeant.

He said: "I know that there are some children as young as 15 who are on the list, and in my opinion that is disgraceful.

"Within our party, young people have to be at least 16 before they can even join a youth branch, and is it beyond belief that the BNP are targeting youngsters like this. It is very worrying."

Simon Darby, the BNP's spokesman, described the posting as "malevolent and spiteful".

"This is being done to destabilise the party after a successful conference in Blackpool and before the elections for the European parliament in June next year," he said.

He said the membership list, which was password protected and encrypted, had been stolen from the party.

"This isn't a question of us mislaying the information, this is theft," he said.

Mr Darby claimed the list contained the names of people who had never been members of the party as well as the names of current and former members.

"We are worried because kids' names are on the list. It is not information that should be in the public domain."

"We are always receiving death threats," he added.

North Wales Police this morning confirmed they would be fully investigating the implications of the leak.

A spokesman said: "North Wales Police are aware of the release of personal information relating to the BNP, and will review this information and how it impacts on our area.

"It is important to note that North Wales Police will respond in the usual robust manner to any reports of offences attributed to this information release."

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