Sinhala Ravaya leader Akmeemana Dayaratne Thera was arrested by the Colombo Crimes Division (CCD), a short while ago.
The monk was being investigated into acts of aggression against a group of Rohingya refugees from Myanmar.
The refugees – mostly women and children – were being sheltered at a safe house in Mount Lavinia when a group led by monks confronted them.
The Mount Lavinia Police intervened in the situation moved the Rohingya refugees from the safe house to the Boosa Camp for safekeeping.