Northern Ireland Is Experiencing Its Worst Violence in Years. What's Behind the Unrest?

Scenes of violence on the streets of Northern Ireland this week prompted many to recall the country’s troubled past: rioters pelting rocks at police, young men with covered faces throwing petrol bombs and bricks. Videos shared on social media Thursday showed a driverless bus rolling down a Belfast street with its doors open. Two young men, dressed in black, pelt it with Molotov cocktails. Another video taken minutes later shows the vehicle engulfed in flames. The driver, chased from his cockpit seconds before, escaped unhurt but shaken.-- More...