RADICAL Islamic fighters killed seven foreign hostages in Nigeria, European diplomats have said, making it the worst such kidnapping violence in decades for a country beset by extremist guerrilla attacks. Nigeria's police, military, domestic spy service and presidency remained silent over the killings of the construction company workers, kidnapped on February 16 from northern Bauchi state. The government's silence only led to more questions about the nation's continued inability to halt attacks that have seen hundreds killed in shootings, church bombings and an attack on the United Nations. The latest victims were four Lebanese and one citizen apiece from Britain, Greece and Italy. Britain...