The statement added that despite the end of the outbreak in Liberia, the disease could flare up in the region in future.
Liberia was already declared free of Ebola in May 2015, but more cases of the disease had been reported since then. A country is declared free of Ebola if there are no more recorded cases of the disease in 42 days after the last confirmed patient tested negative for Ebola virus twice.
The most recent Ebola outbreak began in December 2013, spreading across Western Africa from Guinea to Liberia and Sierra Leone, killing over 11,000 people in these three countries. In December 2015, the WHO declared Guinea free of the deadly disease. Earlier in 2015, Sierra Leone was also declared free of Ebola.