Rioting and violent protests taking place after a crime is carried out by a migrant — or someone believed to be one — are becoming a feature in the UK. They are slowly starting to form a serious challenge to law and order and community cohesion in a multiethnic and multireligious society. The pictures from Belfast in Northern Ireland last week of violent and unnecessary riots were a reminder of the confrontations from the dark days of communal strife between Catholics and Protestants, republicans and unionists.

Rioting and violent protests taking place after a crime is carried out by a migrant — or someone believed to be one — are becoming a feature in the UK. They are slowly starting to…

Disorder over migrant knife attack shines a light on new era of political violence fuelled by social media