A man has been arrested in Devon and is being questioned in connection with the disappearance of Leicester woman Anne Simpson eight years ago.
Lincolnshire Police have begun searching Lakeside Caravan Park at Sutton on Sea.
It comes after an anonymous phone call from a public telephone box in Wigston, Leicester..
60-year-old Mrs Simpson was last seen in Skegness, Lincolnshire, on 26th September, 2004.
Police say the case is not being treated as a murder inquiry.
– Detective Inspector Nigel Storey, Lincolnshire Police
"One theory could be that Anne has voluntarily gone missing, although from the inquiries we've done that's probably unlikely.
"Another one is that Anne has possibly taken her own life or she could be lying undiscovered somewhere after a fatal accident.
"At this moment in time we cannot establish a connection between Anne and the caravan site."