Ebola outbreak: Sierra Leone to be declared disease-free

People in Sierra Leone are celebrating ahead of expected official confirmation that the country is free of Ebola.

The outbreak killed almost 4,000 people in Sierra Leone over the past 18 months.

The World Health Organization is expected to confirm the news later.

Thousands of people took to the streets of the capital, Freetown, at the stroke of midnight - marking 42 days without a single case.