Up to 40 stations on the London Underground network are to be shut as the city attempts to reduce the effect of the coronavirus outbreak.
Transport for London (TfL) announced there would be a partial shutdown of the network from Thursday morning.
There will be no night Tube and bus services will also be reduced, it said.
Mayor of London Sadiq Khan said people should not be travelling and warned services were “likely to reduce, potentially very significantly”.
The move comes after Boris Johnson said the virus was spreading faster in London than other parts of the UK.
Latest government figures show there have been more than 900 confirmed cases of coronavirus in London and 34 people have died in the city.
Earlier this week, the prime minister urged people to work from home and to avoid bars, pubs and restaurants. Schools, meanwhile, will close from Friday.