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3 January 2013, 15:50 | Updated: 3 January 2013, 15:52
Between 1979 and 1991 there were more than 200 arson attacks against holiday homes and estate agents' in North Wales by Meibion Glyndwr (Sons of Glyndwr) and letter bombs were delivered to politicians.
There was only one conviction and those behind the campaign were never brought to justice, even though MI5 were brought in to try and catch them.
North Wales police have replied to a Freedom of Information inquiry about whether, with recent DNA and other forensic advances, there had been any “cold case” attempts to find those responsible.
In reply the force says that files and exhibits from scenes are retained. It adds : "These investigations are not live but are subject of review which looks at ways of developing forensic advances amongst other investigative opportunities. I can confirm that the incidents are still recorded as crimes.
“We are unable to comment further on individual cases or disclose any methods adopted during the reviews.”