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23 March 2011
Last updated at 06:26 ET
Police investigating the disappearance of a woman after she left a Swindon nightclub have said "significant lines of inquiry" are being developed.
Hundreds of volunteers joined police on Tuesday to search thousands of acres of Savernake Forest, Wiltshire, in the hunt for 22-year-old Sian O'Callaghan.
Det Supt Steve Fulcher said he had now ruled out large parts of the forest and the inquiry was moving rapidly.
He said new techniques had given police a "tighter search parameter".
Det Supt Fulcher said the public were no longer being asked to join the search on Wednesday.
Miss O'Callaghan has been missing since leaving the Suju club to walk home at about 0250 GMT on Saturday.
'Urgently progressed' A signal from her mobile phone was picked up from Savernake Forest, near Marlborough.
Mobile records put her phone in the area of the 4,500-acre wood, 32 minutes after she left the club on what should have been a walk home of about half a mile (800m).
Det Supt Fulcher said: "I've been able to use new technological techniques to provide a tighter search parameter and have been able to rule out large areas of the six-and-a-half mile radius we have all been searching.
"Those tactics are being urgently progressed today by specialists."
He added: "The inquiry moves on at a rapid pace with significant lines of inquiry being developed.
"The public have been fantastic in support of the search for Sian O Callaghan and I'm very grateful.
"I may need further support from the public closer to the weekend but for now I would ask that people monitor the force website, media and social networks for my further requests if they are required."
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Hundreds of volunteers joined police on Tuesday to search thousands of acres of Savernake Forest, Wiltshire, in the hunt for 22-year-old Sian O'Callaghan.
Det Supt Steve Fulcher said he had now ruled out large parts of the forest and the inquiry was moving rapidly.
He said new techniques had given police a "tighter search parameter".
Det Supt Fulcher said the public were no longer being asked to join the search on Wednesday.
Miss O'Callaghan has been missing since leaving the Suju club to walk home at about 0250 GMT on Saturday.
'Urgently progressed' A signal from her mobile phone was picked up from Savernake Forest, near Marlborough.
Mobile records put her phone in the area of the 4,500-acre wood, 32 minutes after she left the club on what should have been a walk home of about half a mile (800m).
Det Supt Fulcher said: "I've been able to use new technological techniques to provide a tighter search parameter and have been able to rule out large areas of the six-and-a-half mile radius we have all been searching.
"Those tactics are being urgently progressed today by specialists."
He added: "The inquiry moves on at a rapid pace with significant lines of inquiry being developed.
"The public have been fantastic in support of the search for Sian O Callaghan and I'm very grateful.
"I may need further support from the public closer to the weekend but for now I would ask that people monitor the force website, media and social networks for my further requests if they are required."
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