Additional police forces from Britain were called on to provide security for the marches. Numbers of Members of the Orange Order were estimated to be in the tens of thousands, dispersed across twelve venues. The trouble began as protestant marchers – who hold Orange parades every summer to proclaim their loyalty to the United Kingdom – passed a group of nationalists at St Patrick’s church near the Ardoyne area of Belfast. Tensions mounted between the two sides as nationalists charged the Orange Parade bandsmen and threw police cones at them. Officers then intervened, forming a cordon between the two groups. Officers “continue to be attacked by rioters in several parts of Belfast. A number of officers are injured… the police are dealing with a serious disorder in the Woodvale Road area of North Belfast,” the Police Service of Northern Ireland said in a statement. A peace agreement in 1998 effectively ended three decades of Catholic-on-Protestant violence, but Belfast remains a sharp dividing line between the two groups to this day.