GUNMEN have abducted at least 10 healthcare workers in Nigeria's Niger state and killed an unspecified number after bandits invaded a general hospital early, a hospital and a military source said. Armed bandits operating for cash have kidnapped or killed hundreds across northwest Nigeria. Niger state officials have said that the Islamist militant group Boko Haram had taken over multiple communities in the state, offering villagers money and incorporating them into their ranks to fight the government. The hospital source said more than 20 staff were kidnapped, including patient relatives, while the security source said two people had been killed…