Former world chess champion Vladimir Kramnik has asked Swiss authorities to investigate threatening messages posted online since the sudden death of U.S. grandmaster Daniel Naroditsky, according to a copy of the filing seen by Reuters on Sunday.

Introducing WIRED’s 2025 Political Power Users—the creators, podcasters, and pundits who will blow up the next electoral era.

Major airports in Brussels, London and Berlin were hit by disruptions to electronic systems that snarled up check-in and sent airline staffers trying options like handwriting boarding passes.