US spy agencies are still hamstrung by the same turf battles and financial mismanagement that led to massive intelligence failures revealed by the 9/11 attacks and the Iraq war, an internal report has found.

The report, made public on Wednesday, was the most detailed of its kind on challenges facing the 16 spy agencies. It came four years after the Office of the Director of National Intelligence (ODNI) was created to remedy them.

"The culture of protecting 'turf' remains a problem, and there are few, if any, consequences for failure to collaborate," said the report, completed by the DNI's inspector general in November.