A bomb-sniffing dog has been fired from the CIA after she lost interest in finding explosives.

Lulu the labrador started out as a promising recruit in the latest intake of puppies for the US intelligence agency's training programme.

Then, according to the agency, a few weeks later she started showing signs she was no longer interested in “detecting explosive odours”.

Lulu's handlers tried to work out what was affecting her, as puppies can go through periods where they lose focus in their training.