Extremism in the Middle East

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Almost 100 people have died so far in Israeli airstrikes on Gaza. And Palestinian rockets continue to fall on Israeli cities, after four days of conflict there. This was all sparked by the murder of three Israeli teens, and the subsequent killing of a Palestinian kid, presumably by Israeli extremists looking for revenge. So, who are these extremist factions on both sides of the divide that have - once again - been able to turn the region into a war zone?