Hamas lawmakers sign on a document prohibiting any concessions over Palestinian rights in Jerusalem and the right of return for refugees in the Annapolis Middle East peace conference, in Gaza November 26, 2007. Vowing to go on fighting the ''Zionist enemy'', Hamas called Mahmoud Abbas the worst leader in Palestinian history on Monday and said he had no right to make concessions to Israel at the Annapolis peace conference. REUTERS/Suhaib Salem
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