Police warn Belfast riots could get out of hand

Nationalist Youths throw rocks, bricks and petrol bombs at police during fierce clashes in Northern Ireland
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A car is set alight as Nationalist Youths throw rocks and petrol bombs at Police during rioting in Belfast, Northern Ireland, on July 12, 2011. A second night of rioting broke out in Northern Ireland at the height of the Protestant marching season, with police officers attacked and numerous people arrested, police said Wednesday. (AFP/Getty Images)
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Northern Irish police said on Wednesday they fear rioting in Belfast could escalate to the point where someone gets killed, threatening to upset a delicate peace between Catholics and Protestants in the British-controlled province (AFP/Getty Images/ Text: Reuters)
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Orangemen march past a Nationalist area at the start of their Twelfth of July celebrations in Belfast, Northern Ireland, on July 12, 2011. Serious rioting erupted in Belfast injuring 22 officers, police said, as tension mounted before Tuesday's culmination of . (AFP/Getty Images)
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Orangemen march past a Nationalist area at the start of their Twelfth of July celebrations in Belfast, Northern Ireland, on July 12, 2011. Serious rioting erupted in Belfast injuring 22 officers, police said, as tension mounted before Tuesday's culmination of Northern Ireland's main Protestant marching season. Police used water cannon and fired 51 plastic bullets to try to disperse around 200 Catholic rioters in the Broadway area of mainly Catholic west Belfast on Monday night. Rioters responded with a hail of bricks and more than 40 petrol bombs. (AFP/Getty Images)
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Northern Ireland's main Protestant marching season. Police used water cannon and fired 51 plastic bullets to try to disperse around 200 Catholic rioters in the Broadway area of mainly Catholic west Belfast on Monday night. Rioters responded with a hail of bricks and more than 40 petrol bombs (AFP/Getty Images)
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Bonfires are traditionally lit in protestant areas on the 11th of July to mark the start of the Twelfth Celebrations. The cranes in the distance are in the Harland and Wolfe shipyard where the Titanic was built later other Nationalist areas saw intense rioting and petrol bombing of police (AFP/Getty Images)
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Riot police with battons try to restore calm after a crowd of Nationalist Youths clashed during rioting which ensued after a Protestant Orange Parade in Belfast, Northern Ireland on July 12, 2011. Trouble first flared late the day before when Protestants began lighting bonfires, the signal for the start of a day of celebrations during which thousands of 'Orange Order' men are expected to march. (AFP/Getty Images)
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A Nationalist Youths dances in defiance as police fire a water canon during rioting (AFP/Getty Images)