" 
 :::::The purpose of putting articles in a category is to conglomerate articles that are related to each other. Because those two groups are the main ""suspected perpetrators"", then that means that both kinds of terrorism are related to this article, until a specific verdict is made, and then one of the categories can be removed. But, if both are suspected, then both should be included for searching and conglomeration purposes, since the subject is definitely related to those two categories.  "