The World Health Organisation WHO has announced that one person has tested positive for the Ebola virus in Liberia.

The news comes almost three months after the country was declared Ebola free by the WHO in January 2016.

WHO had said during the declaration that " all known chains of transmission have been stopped in West Africa. But the Organization says the job is not over, more flare-ups are expected"

In a tweet WHO indicated that the situation is being investigated.

Meanwhile the virus has also reared its head in Guinea forcing neighbouring country Sierra Leone to close its borders with Guinea.

A journalist from Sierra Leone Umaru Fofona shared on facebook the news of the closure of the boarder.

The Ebola outbreak begun in 2014. The virus killed over 11, 000 people according to WHO figures and affected over 28,000 with Guinea Sierra Leone and Liberia being the hardest hit.