Australian police have no Outback ambush suspects

Australian police hunting for missing British tourist Peter Falconio have admitted they don't have any suspects or leads in their investigation - almost a month after his disappearance.

Detectives are also concerned that his girlfriend Joanne Lees' memory of what happened may have been affected by shock.

The Northern Territory's Crime Commander, Assistant Commissioner John Daulby, has admitted the investigation is not going well.

He said: "We don't have any suspects in the Lees matter and the Falconio matter. We don't have any leads."

Police also said that Alice Springs service station security camera images of the suspected gunman should have been released weeks ago.

But the tapes were delayed because Northern Territory police were forced to wait in a queue for the images to be enhanced by another State's police force.

They show a man fitting the description of the gunman but do not reveal the registration of his car.

Assistant Commissioner Daulby refused to comment on whether Ms Lees had positively identified the man in the service station footage as her attacker but ITV News reported that Miss Lees has apparently told police that she does not believe that he was the man who attacked her.

Assistant Commissioner Daulby said that DNA evidence proves that there was an unknown man at the scene of the attack but he pointed out that trauma may have affected Miss Lee's recollection of events.

Mr Daulby said: "It is possible that she has blocked things. She may be suffering from trauma, post-traumatic stress."