It has been a humiliating week for nearly 300 Romanian mercenaries recruited to fight on the side of the army in the Democratic Republic of Congo. Their surrender following a rebel assault on the eastern city of Goma has also shattered the dreams of those who signed up for the job to earn big money.

The United Nations expressed deep concern at reports of M23 rebels and Rwandan troops advancing south towards the Congolese city of Bukavu on Thursday, as the militants sought also to assert their control over east Congo's largest city Goma.

Rwanda-backed rebels who have captured eastern Congo’s largest city say they plan to take their rebellion to the capital and seek to gain political power.