In the Arabs' Struggle Against Israel, There Are Many Players
To most Israelis, and to much of the world, the unremitting series of suicide attacks that have pushed Israel to proclaim Yasir Arafat, the Palestinian leader, an "enemy" and assault his headquarters in Ramallah are the work of Palestinian terrorists, acting sometimes with the tacit approval of Mr. Arafat.

But the terror attacks are in fact the work of distinct and sometimes rival organizations, with different ideologies, allegiances, financing and goals.
http://www.nytimes.com/2002/03/30/international/middleeast/30FACT.html