'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crime agencies hampered the probe into Madeleine McCann's disappearance, according to the author of a previously unpublished report on the investigation.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
A Ukip councillor has been expelled from the party after allegedly making "jaw-dropping" comments in a TV interview.
"He was their for me everyday of my life, he was the best father I could ask for," Rafael Ramos's 13-year-old son said.
Ben Haenow's dreams came true for a second time tonight after his debut song Something I Need was declared the UK's official Christmas No.1.