The EPR nuclear power plant, under construction in Finland and 18 months behind schedule, is reported as having a number of safety-related design and manufacturing "deficiencies."
- New Scientist
- At least two people are reportedly killed, and several others wounded in a stabbing in Turku, Finland. Police said they arrested one person after a shootout and had launched a manhunt for other possible attackers.
- Voters go to the polls for municipal elections in Finland.
- Chinese president Xi Jinping visits Finland on his way to the United States.
- Russian president Vladimir Putin attends the International Arctic Forum in Arkhangelsk, Russia. He says there that he is ready to meet U.S. President Donald Trump in Helsinki, Finland.
- Three women, the Imatra Town Council chairwoman and two local reporters, are shot dead outside a restaurant in Imatra, Finland, a town east of the capital, Helsinki. A 23-year-old suspect is apprehended by police.