A man is in a critical condition in Middlemore Hospital after breaching his bail and being put in a police custody unit.
The man was arrested at an Otara property on Monday after breaching his electronically monitored bail.
Counties Manukau District Commander superintendent Jill Rogers said en route to the Manukau Custody Unit the man started acting unusually and became aggressive.
His erratic behaviour continued and he tried to injure himself while in a cell in the Manukau Custody Unit.