Finnish Prime Minister Sanna Marin will be working remotely from her official residence as a precautionary measure taken due to possible exposure to the coronavirus, the government says.
The decision to self-isolate came after a new warning app - created by the Finnish Institute for Health and Welfare, among others - alerted Marin of a potential exposure to the virus.
The app, launched a week ago, was downloaded more than 1 million times the day after its release.
A person who has tested positive for the virus can use the app to share this information anonymously with others they have been in close contact with, helping to stop infection chains.
The 34-year-old prime minister was "feeling fine" and did not show any symptoms, the government said.
Finland has recorded 337 coronavirus-related deaths and about 8400 infections as of Thursday.