Assignment - A City Divided

At the end of last year, violent clashes broke out in Jos in central Nigeria after a disputed local election. Christian and Muslim mobs took to the streets burning mosques, churches and homes. Hundreds were killed: in some of the worst incidents, children were burnt inside their schools. This is just the latest round in a cycle of sectarian violence that has killed at least ten thousand Nigerians over the past decade. Robert Walker travels to Jos, a town still under curfew, to find out what caused the clashes and to investigate why many residents believe more violence is likely.