Police now believe missing Christchurch woman Emma Campbell's disappearance has been staged.
The 29-year-old's car was found off Dyers Pass Road in the Port Hills nearly three weeks ago, but an intensive search of the area did not find any clues on her whereabouts.
Detective Senior Sergeant John Rae says the police believe Miss Campbell's car was run off the road deliberately, as it was being driven slowly and there are no skid marks.
He says the question puzzling the police now is whether anyone else is involved in her disappearance.
Police are still treating her disappearance as a missing person inquiry and ask anyone with information about her whereabouts to contact them.