Conspiracy theories about so-called false-flag attacks have been around for decades. But as trust in media and public institutions craters, every single major news event is now being labeled as fake.

In a series of escalating statements, Russia’s foreign intelligence service has accused Western countries of plotting “false flag” operations to discredit Moscow. While the claims lack evidence, ...

Social media users have branded an arson attack on Jewish ambulances in Golders Green a false flag operation, as police investigate the incident as an antisemitic hate crime. The early morning blaze ...