London - West Africa's raging epidemic of Ebola virus is an “extraordinary event” and now constitutes an international health risk, the World Health Organisation (WHO) said on Friday.

The Geneva-based United Nations health agency said the possible consequences of further international spread of the outbreak, which has killed almost 1 000 people in four West African countries, are “particularly serious” in view of the virulence of the virus.

“A co-ordinated international response is deemed essential to stop and reverse the international spread of Ebola,” the WHO said in a statement after a two-day meeting of its emergency committee on Ebola. - Reuters