Updated:Angry young men confront police in Northern Ireland on Saturday. It's not unusual for the annual Protestant Orange Order marches in Belfast to turn violent. The parades are a regular flashpoint for sectarian clashes. A high profile peace deal in 1998 largely ended three decades of strife in Northern Ireland. But Belfast is still riven with religious and nationalist tension between Protestants loyal to the British government and Catholics, many of whom favour reunification with Ireland.