From the abstract of Ryan Bishop's Introduction to the special section :
The scale and diversity of megacities finds analogous scale and diversity in the violence witnessed and experienced in these complexly dense urban sites. From full-scale military invasion to internecine ethnic and tribal conflict, from paramilitary incursions to strategic car bombs, from slum clearance to pervasive everyday low-level violence, from Mafia-led armies to incessant inflictions of violence on the urban poor, and from missile launches to machete attacks, megacities, most unfortunately, have them all.