Yet another one. This one was carried out by the Popular Front for the Liberation of Palestine. PFLP is a typical marxist group, which "aims to mobilize and lead the struggle of the Palestinian masses for the return to Palestine, self-determination, and the establishment of a Palestinian state. These, in turn, are steps along the path of defeating the Zionist entity, liberating all of Palestine, and establishing a democratic Palestinian state where all citizens enjoy equal rights, free from discrimination on the basis of race, sex, or religious belief. Beyond this, the PFLP aims at the establishment of a democratic socialist society." Among other links, they have the Arabic words to The Internationale, the "worker's anthem", on their site.
Something tells me that a "democratic socialist" Palestinian state would not be free from discrimination on the basis of race, sex, or religious belief. The fact that their website has a picture of Al-Aqsa mosque dominating the home page would seem to indicate a predisposition towards Islam. I could be wrong, but I doubt it.