Northern Ireland unrest: Four key questions answered

Long-simmering tensions have been brought to the boil by Brexit, worsening relations between leading political parties.

Northern Ireland’s devolved government is holding an emergency meeting on Thursday over an outbreak of unrest, as Brexit shakes a fragile political balance. On Wednesday, the fourth night of violence in a week, rioters hijacked a bus and set it on fire and hurled petrol bombs at police in the capital, Belfast. Dozens of police officers were injured. The turmoil comes as frustration grows among pro-British unionists at new post-Brexit trade barriers between Northern Ireland and the rest of the United Kingdom.