Abstract: A communication system and method provide for automatic arrestee grouping and action recommendation during a mass incident arrest. A portable radio sends a notification to a server indicating a mass incident event with grouping request for grouping arrestees. The server returns an electronic form including a mass arrest ID based on type of mass event. The electronic form facilitates collecting individual arrestee information based on the type of mass event. Current offense type and personal attribute information are collected and further electronically tagged to each arrestee. The server automatically assigns each arrestee to an offense group based on current offense type, and then refines the offense group into sub-groups based on prior arrest records. The server generates arrest processing procedure recommendations customized for each sub-group and transmits the recommendations to the PS radio associated with the grouping request.