As at 4 March, there are 153 critical public protection cases registered with the Public Protection Unit (PPU) in the National Offender Management Service (NOMS). Each critical public protection case is managed under the Multi-Agency Public Protection Arrangements (MAPPA). Within MAPPA, the Police, Probation and Prison Services collaborate to assess and manage the risks presented by offenders, with co-operation from a number of other agencies. The NOMS PPU may provide additional funds to support local risk management arrangements for critical public protection cases.