The Red Cross voiced alarm on Monday after six workers taking part in a desperate bid to contain a deadly Ebola outbreak were injured in attacks last week in the Democratic Republic of the Congo (DRC).

"Attacks against volunteers and humanitarian personnel are unacceptable," the International Red Cross and Red Crescent Movement said in a statement, along with the Red Cross societies of the DR Congo and Uganda.

The statement said that on 17 August, a Ugandan Red Cross convoy helping the Ebola response was attacked in Ituri province, the outbreak's epicentre, with one person seriously injured and two ambulances pelted with stones and vandalised.

The following day, two volunteers were injured while attempting to conduct a burial in Haut-Uele province. They were evacuated for medical care, during which two vehicles were damaged.

Then on Wednesday, in Beni in North Kivu province, three volunteers were "attacked and injured" with equipment used in the Ebola response destroyed.