Two staff members of the U.S. Embassy in Nigeria were shot and killed along with two police operatives traveling in a convoy, and three others were kidnapped, police in the volatile West Africa nation said Tuesday. The group was on a humanitarian mission when they were attacked in the Ogbaru Local Government Area of the country's Anambra State, one of the epicenters of separatist violence in the region, said Tochukwu Ikenga, a police spokesman in Anambra. Ikenga said no U.S. citizen was on the trip. "We confirm there was an incident May 16 in Anambra state. Mission Nigeria personnel are...