For a third night, riots rocked the town of Ballymena in Northern Ireland, with protesters throwing petrol bombs.

Anti-immigrant riots began in Ballymena, but economic grievances may not be enough to explain the phenomenon. Anti-immigration protests have escalated into clashes with police in several towns in Northern Ireland this week, marking a new wave of unrest to hit the United Kingdom.

The police said that attacks on houses and businesses in the town of Ballymena were being investigated as racially motivated, and that 15 officers had been injured.