Authorities are zeroing in on a French ski resort where five British citizens have contracted the coronavirus.
The five Britons, including a nine-year-old child, were part of a group of 11, staying in the same chalet at Les Contamines-Montjoie in the Alps.
The resort is part of the Mont-Blanc area.
France's Health Ministry says they were staying in the same accommodation as a man who is believed to have contracted the disease in Singapore, according to French news network France24.
Sky News says that man is now being treated at Guy's and St Thomas' Hospital in London.