Police in Scotland searching for a missing teenager have cordoned off part of a country park in Kilmarnock.
A tent has also been erected in Dean Park as part of the investigation into the disappearance of Hazel North.
The 19-year-old, from the Cairneyhill area of Dunfermline, in Fife, was reported missing on Friday.
She last made contact with her sister by phone on 4 March, after telling her that she was going to meet a friend in Kilmarnock.
Forensics experts searched a flat and garden in Kilmarnock over the weekend, but did not find anything suspicious.
On Saturday, police said there had been a possible sighting of Ms North in Stranraer, where her family lived, on Tuesday.
The sighting was made about midday, when Ms North was thought to have been in the company of another woman, who was described as being about 5ft 8in tall, of medium build with short, dark hair in a bob style.
Police are continuing investigations in Dunfermline, Kilmarnock and Stranraer and particularly want to speak to the woman who may have been seen with Ms North last week.
Her family was said to have grown “increasingly concerned” for her safety.
Ms North is described as being 5ft 8in in height and of slim build with a fair complexion. She has brown hair.
Supt Kerr told BBC Scotland police were only informed of the teenager's disappearance on Friday.
"Hazel North is a vulnerable missing person," he said. "We have carried out an extensive search of the house and rear garden as we would with any missing person inquiry.”
"But we haven't uncovered anything that would give us any cause for concern at this stage," he said.
He urged Ms North, or anyone who knows where she is, to contact police.
"Hazel, if you are out there, can you please get in touch with police as soon as you can and let us know that you are ok."
Officers throughout the country are working on the investigation.