At least 11 people were killed in attacks over the past day in the rebel-held Democratic Republic of Congo city of Bukavu as vigilante violence rises following the army's withdrawal, witnesses and a civil society activist said on Thursday.

Since January, however, the rapid conquest and occupation of a huge area of the Democratic Republic of Congo by Rwanda and the M23 rebel group it supports has raised concerns that the principle may now be endangered.

In Bukavu, a city in eastern Democratic Republic of Congo, at least 11 people have been killed in vigilante attacks following the withdrawal of the army. M23 rebels are trying to impose order, retraining police under their control,

Rwanda-backed rebels who captured eastern Congo’s major city of Goma have targeted relatives of fleeing Congolese soldiers

U.K. authorities are punishing Rwanda over its support of the rebels who now control two major cities in eastern Congo.

Cyclists, organisers and fans tell the BBC there were no security issues on the Tour du Rwanda, despite fighting across the border in DR Congo.