US scolds Rwanda for breaking peace deal as M23 rebels seize key Congo city

Mike Waltz warns spoilers' will be held to account as rebel fighters escalate offensive in South Kivu province

The US has accused Rwanda of violating a US-brokered peace agreement by backing a deadly new rebel offensive in the mineral-rich eastern Congo, and warned action will be taken against spoilers".

The remarks by the US ambassador to the UN, Mike Waltz, came as more than 400 civilians have been killed since the Rwanda-backed M23 rebels escalated their offensive in eastern Congo's South Kivu province, according to officials who also say Rwandan special forces were in the strategic city of Uvira.