Rwanda-backed M23 insurgents shot dead three boys who had picked up guns left by Congolese soldiers fleeing the rebel advance in eastern Congo, the U.N. said on Tuesday, adding the incident to a list of grave human rights violations reported during the conflict.

Government forces and local militias have clashed south of the provincial capital of Bukavu in eastern Democratic Republic of Congo as troops fall back in the face of an advance by Rwanda-backed M23 rebels,

M23 rebels have captured Bukavu, the second largest city in the Democratic Republic of Congo. This comes as the African Union warned that strife in the country could lead to a potential breakup. Watch this report for more details!