'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crime agencies hampered the probe into Madeleine McCann's disappearance, according to the author of a previously unpublished report on the investigation.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
So today is Towel Day. It's been trending on Twitter, has its own Facebook page and website, and even Tim Peake has got in on the action.
An Australian man who kidnapped, drugged and raped a German backpacker has been jailed for nine years.
A New York man has been charged with murder after he was allegedly spotted wheeling the body of his dead wife down a street in a trolley.