At least 20 people are believed to have died in two days of violence in the southern Nigerian city of Onitsha. Christian mobs rampaged through the city attacking Muslims in retaliation for anti-Christian riots in the north. Nigerian police said hundreds of Christian Ibos attacked houses belonging to Muslim Hausas when news of the northern clashes reached Onitsha. Danish cartoon protests in the north led to sectarian clashes which have seen dozens of deaths in four cities. Full Story