'I'm afraid this virus is out of control,'the mayor of London said, after declaring a major incident with the capital's hospitals struggling to cope with coronavirus patients. 'The NHS in London is at risk of being overwhelmed ... we could run out of beds,' Khan added. The mayor told BBC News that as many as one in 20 people had the virus in some parts of the city. 'The best way you can help the NHS is by staying at home,' he said.