Rwanda's ally Uganda, unhappy about another rebel group in DR Congo that threatens its security, has also been accused of helping the M23 - with its officers also spotted at Tchanzu. The UN experts say Uganda has also supplied weapons, hosted rebel leaders and allowed cross-border movements of M23 fighters - accusations Kampala denies.

The president of the Democratic Republic of the Congo announced a strong response from the Congolese army to the armed attacks by M23 rebels, accusing Rwanda of supporting the rebels and the international and African communities of remaining silent over tensions on the border.