Orangemen march amid tight security past the Nationalist Ardoyne area of North Belfast, Northern Ireland, on July 12, 2010. Rioting by Catholics left 27 police injured in Northern Ireland, including three with gunshot wounds, officials said Monday, ahead of the biggest day of Northern Ireland's marching season. The overnight violence in Belfast saw missiles being thrown and petrol bombs ignited as Catholics took to the streets hours before Protestant Orangemen march in a traditional flashpoint in the British province. AFP PHOTO/STEPHEN WILSON (Photo credit should read STEPHEN WILSON/AFP/Getty Images)