The Ebola virus, which has killed more than 670 people in West Africa, poses a threat to the UK, Foreign Secretary Philip Hammond has told the BBC. He said he would chair an emergency Cobra meeting on the issue later. Mr Hammond said no Britons had been affected so far and there were no cases in the UK, but the government was viewing the outbreak very seriously. Earlier this month Public Health England issued an alert to UK doctors to be aware of Ebola's symptoms. Several West African airlines have now stopped flying to Liberia and Sierra Leone amid concerns about the spread of the disease to those countries from Guinea. The move by airlines comes after an infected American man of Liberian descent was found to have flown from Liberia to Nigeria last week. He developed symptoms during the flight.