Campaigners believe a third person was involved in the deaths of Griff and Martha Thomas.
Retired farmer Mr Thomas and his sister were found dead in their burning farmhouse where they had lived together for 70 years.But an inquest in February 1977 found Mr Thomas guilty of manslaughter after his sister, known locally as Pati, had suffered serious head injuries, while an open verdict was recorded on his death.Many people in the village have maintained that the retired farmer, who had arthritis, could never have attacked the sister he had lived with for more than 70 years.
Det Supt Paul Jones said: "Significant developments have been seen in forensic science over the last forty years which may provide additional information even in cases of this age. "They [the police] show that they take seriously the claim made by Clebran that the verdict of the inquest in the case of Martha and Griff Thomas was not safe," said Hefin Wyn.
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