Health workers involved in tackling Ebola in the eastern Democratic Republic of Congo city of Beni are resuming their outreach operations following a two-day suspension because of an attack by rebels.

The attack, suspected to have been carried out the Ugandan group the Allied Democratic Forces (ADF), killed at least 18 people, including 14 civilians.

The local authorities agreed to allow the health workers to restart following a warning by the World Health Organisation (WHO).

The WHO said efforts to control Ebola had to resume because it was spreading to border areas and Uganda was facing an imminent threat.

The health workers will now be able to continue with vaccinations and the tracing of people who have contact with suspected Ebola patients.

A hundred people have died since the start of the outbreak in July.