Rebel fighters and Rwandan troops are accused of committing atrocities after capturing the DR Congo city of Uvira in December.
Related stories
North Korea, on Busiest Missile-Testing Spree in Years, Rebuffs Trump Diplomacy
Midterms: What impact did redistricting in California and Texas have?
Democrats aim to sweep most US governor elections after wins in key states
‘We defeated Goliath’: Texas Democrat James Talarico wins Senate seat
Blue wave 'turning into a tsunami' as Democrats take control of Congress
Democrats’ blue wave and a bad night for Trump: key US midterms takeaways