'Organisational arrogance' on the part of different crime agencies hampered the probe into Madeleine McCann's disappearance, according to the author of a previously unpublished report on the investigation.
Jim Gamble told the Guardian: "Each one thought that their agency would bring the best to bear on this. We were all guilty."
He also told Sky News that different agencies trying to make their mark "created a sense of chaos and a sense of competition".
Mr Gamble, the former head of the Child Exploitation and Online Protection Centre, said this had also damaged the relationship between British and Portuguese investigators, leading to further difficulties.
More top news
David Davis is hoping to push Brexit withdrawal talks towards discussions on a future trading relationship between the UK and EU.
A fine start to Sunday but rain moves in from the southwest later on.
A second police officer has died after he and a colleague were shot as they scuffled with a suspect in Florida.