It also recommended the council should conduct an external independent review to help identify lessons learned.

A PPO spokesman said: The investigation will identify lessons to be learned to prevent similar deaths of young people.

The aim of the study was to identify lessons for future practice, training needs, operational planning and resource management.

Grayling said that although the Harris review would focus on 18- to 24-year-olds, it would identify lessons that would benefit any age group.