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Photo by: Niall Carson

Nationalist protesters build barricades across the street during clashes with police in Belfast, Northern Ireland, late Monday July 12, 2010. Police struggled Monday overnight till early Tuesday, to quell rioting by Irish Catholic nationalists in several parts of Northern Ireland following a day of mass Protestant parades, an annual event that often pushes sectarian animosity past boiling point. (AP Photo / Niall Carson, PA)

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