Guinea

Nigerian health authorities are in the process of tracing more than 30,000 people who could be at risk of contracting Ebola, after the virus surfaced in Lagos.

The authorities have confirmed that a Liberian man who died in Lagos last Friday tested positive for Ebola, Reuters reported.

After the discovery, the hospital that dealt with Nigeria's first known Ebola victim was closed.

Professor Sunday Omilabu, from Lagos University Teaching Hospital, told Reuters the health authorities are now tracing everyone who may have had contact with the victim.

Liberia has suspended all football activities in an effort to control the spread of the deadly Ebola virus.

There was a risk of infection because football is a contact sport, the football association said.

The number of people killed by the virus in West Africa has now reached 672, according to new UN figures.

A major regional airliner, Asky, said it had halted flights to the Liberian and Sierra Leonean capitals because of growing concerns about the virus.

(CNN) -- A doctor who has played a key role in fighting the Ebola outbreak in Sierra Leone is infected with the disease, according to that country's Ministry of Health.

Dr. Sheik Humarr Khan is being treated by the French aid group Medicins Sans Frontieres -- also known as Doctors Without Borders -- in Kailahun, Sierra Leone, Tim Shenk, an agency spokesman, told CNN.

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