Police searching for a woman who vanished three weeks ago in northwest England found a body in a river close to where she was last seen, the Lancashire Constabulary said Sunday. Formal identification of the body is pending. The search for Nicola Bulley, 45, has riveted Britain since she went missing on Jan. 27 while walking her dog along the River Wyre. It also generated a circus of sorts in the tiny community of St Michael's on Wyre as speculation on social media spurred unofficial searches and attracted amateur sleuths.