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What sparked the violence

Violence erupted Monday after a peaceful march to show support for the family of the victim of an alleged sexual assault on the weekend. Two 14-year-old boys have been charged.

The suspects have not been identified because of their age. They were supported in court by a Romanian interpreter.

After the march, a crowd of mostly young people set several houses on fire and pelted police with projectiles. The Police Service of Northern Ireland said 15 officers were injured that night.

There were similar scenes after dark on Tuesday, as well as small pockets of disorder in several other Northern Ireland towns.

Police said agitators on social media were helping fuel what Assistant Chief Constable Ryan Henderson called “racist thuggery.�

The town's history

Some politicians said immigration had strained the town of about 30,000 some 25 miles (40 km) northwest of Belfast, long known as a bastion of hardline pro-British Loyalism.

Jim Allister, leader of the conservative party Traditional Unionist Voice, said “unchecked migration, which is beyond what the town can cope with, is a source of past and future tensions.�

Some Romanians in Ballymena told Britain’s PA news agency they had lived in the town for years and were shocked by the violence.

Several houses in the Clonavon Terrace area that was the focus of the violence put up signs identifying their residents as British or Filipino in an apparent attempt to avoid being targeted.

Henderson said there was no evidence that Loyalist paramilitaries, who still hold sway over Protestant communities, were behind the disorder.

Past Northern Ireland history

Northern Ireland has a long history of street disorder stretching back to tensions between the British unionist and Irish nationalist communities.

Though three decades of violence known as “the Troubles� largely ended after a 1998 peace accord, tensions remain between those — largely Protestants — who see themselves as British and Irish nationalists, who are mostly Catholic. In Belfast, “peace walls� still separate working-class Protestant and Catholic areas.

Street rioters sporadically clash with police, and recently immigrants have become a target.

Anti-immigrant in Northern Ireland as well as England last year after at a Taylor Swift-themed dance class in the northwest England town of Southport. Authorities said wrongly identifying the as a migrant played a part.

Government appeals for calm

Police condemned the latest violence and said they would call in officers from England and Wales to bolster their response if needed.

All the parties in Northern Ireland’s power-sharing government issued a joint statement appealing for calm and urging people to reject “the divisive agenda being pursued by a minority of destructive, bad faith actors."

On the alleged sexual assault, the statement added that “it is paramount that the justice process is now allowed to take its course so that this heinous crime can be robustly investigated. Those weaponizing the situation in order to sow racial tensions do not care about seeing justice and have nothing to offer their communities but division and disorder.�