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"There is a serious risk today that we may see a chain of unilateral actions, which can only push us further away from achieving our shared goal of peace," Mladenov told the UN Security Council.
The Security Council meeting was requested by Britain, France, Sweden, Bolivia, Uruguay, Italy, Senegal and Egypt.
Thousands of Palestinians demonstrated, scores were hurt and at least one killed in clashes with Israeli troops on a "day of rage" on Friday against the US decision.