The witnesses were walking by Furzton Lake, close to where Miss Croucher was last seen, more than a month ago.

Two of the witnesses were walking together and described a young woman

who was "visibly angry, upset and crying".

They said she was white, aged approximately 20, around 5ft 4ins tall, with dark brown, shoulder length hair.

The witnesses saw her again 20 minutes later, when they said she appeared to be in a calmer state and may have been speaking to someone on a mobile phone, they said.