Based on terrorists that perform urban terrorism. Urban terrorists cause as much damage and death as possible through any means. When they destroy property and objects, it is viewed as destruction by fanatics and when it is killing people, it is viewed as mass killing.
"Terrorists that have turned into demons. Death has taken away their ideals, but their ruthless training still leaves them driven to kill. They now kill indiscriminately and destroy whatever they can find, preferring to do their damage in major metropolitan areas. "