Staffing problems are hitting garda armed support units, the national fraud unit, divisional squads tasked with investigating sexual and domestic crimes, and regional cyber crime units.

A specialist unit dealing with sex crimes in Cork city hasn't been able to take on any new investigations since the end of last year because of a shortage of trained personnel.

The Policing Authority is due to hold a special public meeting next week to discuss concerns regarding Garda failures to prosecute serious juvenile offenders.