Open this photo in gallery: Congolese refugees displaced by clashes in eastern Democratic Republic of Congo get ready to disembark from a truck upon arrival at the Gihanga refugee transit camp in Gihanga on Feb. 17.TCHANDROU NITANGA/AFP/Getty Images Three children were executed by the Rwanda-backed M23 after they donned weapons and uniforms abandoned by the Congolese army in the eastern city of Bukavu, the UN human-rights office said on Tuesday, voicing alarm at the incident and other violations since the rebels arrived there. “Our Office has confirmed cases of summary execution of children by M23 after they entered the city...