The UN human rights chief accused Rwanda-backed rebels who seized a second major city in eastern Democratic Republic of Congo (DRC) of killing children and attacking hospitals and warehouses storing humanitarian aid.

Rwandan-backed M23 rebels have entered Bukavu, the second-largest city in the eastern Democratic Republic of Congo, seizing the regional governor's office. Some people lined the streets to clap and cheer the fighters as they marched and drove into the city centre without resistance.

M23 rebels in the Democratic Republic of Congo have captured the eastern city of Bukavu with the backing of Rwandan forces, the second major city in the mineral-rich Kivu region to fall in three weeks.