Two suspicious fires in which three people died are to be reviewed again by police.
Derek Roy, 46, and Derek Youngson, 19, died in a blaze at a flat in Kirk Brae, Fraserburgh, Aberdeenshire, on December 31 2006.
The case - along with that of Gordon Graham who died in a fire in High Street, Fraserburgh, in May 1998 - was reviewed by Grampian Police three years ago and reported to the procurator fiscal.
Police said a link between the two fires will form a part of the new review, during which they may re-interview witnesses.
Detective Superintendent Malcolm Stewart said: "We owe it to the families of the men who died to ensure that no stone is left unturned and, given that it is now three years since the last review was carried out, it is only right and proper that we take a fresh look at these cases.
"We have been in contact with representatives from each family in recent days to inform them of the decision, which they fully support. We must not lose sight of the fact that they deserve justice for their loved ones and we are absolutely committed to making sure that happens.
"Over the coming days and weeks officers will begin re-examining the circumstances surrounding both of the fires, which will include a detailed review of all of the available evidence as well as, where necessary, re-interviewing relevant witnesses."
Police believe there may be new witnesses willing to come forward and they are appealing for witnesses to trace two people seen in the area after the fire in 2006.
Mr Stewart said: "Both of these fires took place in suspicious circumstances and we believe that someone out there knows what happened. Those who might have been reluctant to come forward in the past, for whatever reason, may be more willing to do so now. Families are still grieving for their loved ones and they deserve answers.
"Despite repeated appeals to the public, we have never been able to identify two people seen in the car park at the rear of the old police office following the fire on Kirk Brae. The man was wearing a black tammy hat and was with a female who had her trousers tucked into her knee-high boots. As we've said previously, and I want to emphasise it again today, these people are not considered suspects but may hold information which is of vital importance to the investigation and may not realise it."