In Nigeria, Boko Haram militants recently abducted and killed two aid workers. In the Democratic Republic of Congo, civilians threw stones at Ebola health workers, a day after rebels shot and killed two medics with the Congolese army.#160; London-based research group Humanitarian Outcomes says 139 humanitarian aid workers were killed worldwide in 2017, with another 102 wounded and 72 kidnapped. Data show the bulk of attacks against relief workers took place in South Sudan, Syria, Afghanistan and the Central African Republic. At least 83 more aid workers have been killed this year. The findings were issued in the Aid Worker Security Database, a project of Humanitarian Outcomes. The group...