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Around 400 volunteers have been helping police as they comb Savernake Forest looking for 22-year-old Sian O’Callaghan Hundreds of volunteers have worked alongside police officers and rescue teams to search thick woodland in Wiltshire for missing woman Sian O’Callaghan. Around 400 people helped comb Savernake Forest for traces of the 22-year-old office administrator, including scores who turned up in two coaches, and at one point the police had to ask the public to stay away because they could not cope with more help. A reward of £20,000 was offered by an anonymous donor for anyone who can help find O’Callaghan. Police in Swindon warned people not to walk alone if they could help it. O’Callaghan disappeared after leaving Suju nightclub in Swindon at about 2.50am on Saturday to walk the half mile home to the flat she shared with her boyfriend, Kevin Reape. Analysis of O’Callaghan’s mobile phone records suggests that 32 minutes after she left the club her phone was somewhere in the 4,500-acre Savernake Forest, near Marlborough. Police say the journey there could only have been made in a vehicle and they have been searching the forest since the weekend. After it became clear that scores of people wanted to help comb the forest, police began organising members of the public to look for O’Callaghan herself, her phone, handbag or any other item that could be connected to her or her disappearance. Among those joining the search was labourer James McMurray, 20, from Swindon. “I just wanted to do my bit,” he said. “Nobody deserves to go through that and I’m doing my bit for the community.” Mikey Jack, 19, who plays football with Kevin Reape, said: “Kevin’s a great lad and he doesn’t deserve this and my thoughts are with him and his family. He’s a strong lad and I think he’s hurting a lot.” Police officers also scoured the side of the A346 road between Swindon and Marlborough. They are particularly keen to find O’Callaghan’s missing phone. Detective Superintendent Steve Fulcher, who is leading the inquiry, said: “We know that Sian had an LG E900 Optimus mobile phone with her on the night of her disappearance and I’d like to hear from anyone who finds a phone of this description.” Police released CCTV footage of O’Callaghan leaving the club – the last known sighting. Fulcher said he wanted to hear from people who were close to Suju at the time she left the club and anyone who saw vehicles at beauty spots between Swindon and Savernake between 3am and 4am on Saturday. He added: “I’d also like to take this opportunity to remind people to think about their personal safety and take basic measures such as always making sure someone knows where you are going and what time you will be home, stay with friends and try not to walk alone.” One 28-year-old woman came forward to report that two men tried to coax her into a car in Swindon at 10.15pm on Saturday night. “It was pretty scary and shook me up a bit but I didn’t think much of it until Sian disappeared,” she said. Police are also examining social network sites, including Facebook, used by O’Callaghan and her friends. A spokesman said: “The investigation is very wide reaching and the comments and information on all sites, including social networking, are being considered.”Among the other people joining the search, college student Tizanne Gregory, 17, from Market Lavington, Wiltshire, said: “My cousin was at school with her and my mum knows the family. It is horrible not knowing where she is. My sister lives near Suju in Old Town and you don’t think something would happen there and I am a bit worried.” Maz Wakefield, 27, a friend of Sian’s best friend, Holly Jackson, came to give her support despite being on crutches. She said: “I’d just be sat at home if I wasn’t here and you want to do everything you possibly can. I’m really surprised about how many have turned out to help, I just hope it can make the difference.” Steven Morris guardian.co.uk