THREE new sites have been searched by police investigating the disappearance and murder of Co Down woman Lisa Dorrian.
PSNI officers and specially-trained police dogs have been examining three wooded areas in Craigantlet and Carrickfergus over the last two days.
The fresh searches, which included an area in Cairn Wood in Craigantlet, began on Thursday and continued yesterday.
As part of a new televised appeal for information, PSNI Detective Superintendent Jason Murphy yesterday said Ms Dorrian "knew her killer".
The 25-year-old from Bangor was killed after attending a party in Ballyhalbert Caravan Park in February 2005. Her body has yet to be found.
Police believe the young woman was murdered. However, no-one has ever been charged.
Ms Dorrian's mother, Pat (59) died in 2015 without knowing what had happened her daughter.
Around 400 searches have already been carried out for her body and police have pursued more than 3,500 lines of inquiry in the case.
Detective Superintendent Jason Murphy appealed to anyone with information to come forward, adding "it’s not too late to do the right thing".
"Tragically, Lisa’s loved ones never saw her again and her body has yet to be found," he said.
"Lisa deserved to grow up and have her own family, just like everyone else, however her life was cruelly cut short."
He said it is a case police are "determined to solve".
"Allegiances change, people’s lifestyles change and I want those who were with Lisa that night, or heard accounts of what happened in the immediate aftermath of her murder, or indeed over the years, to search their consciences and come forward to the police," he said.
Mr Murphy added: "There is nothing to suggest that Lisa came to harm at the hands of a stranger, I believe she knew her killer.
"Only a small number of people are aware of what happened and I believe that they may have discussed this with their friends or families in the past 13 years.
"I want you to get in touch with police. I want the killer to know that we have pursued them for 13 years and we remain resolute in seeking justice for Lisa’s family."
Anyone with information is asked to contact police on 101 or Crimestoppers on 0800 555 111.
