Thirty-three gasoline bombs were thrown at police during the demonstrations, after which all the roads were reopened.

CNN: Police deploy water cannon at Northern Ireland riot

One of the most serious incidents occurred at O'Neil's Road in Newtownabbey, where about 100 Protestant rioters -- many of them teenagers -- threw concrete blocks, paving slabs, bricks, planks of wood, gasoline bombs and Molotov cocktails at police.

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