John Leyden, reporting for The Register: Sweden suspects a hacker group linked to Russian intelligence was responsible for an attack on its air traffic control systems last November, we're told. Air traffic control systems across much of Sweden were unavailable on November 4. Computer problems meant air traffic controllers were unable to use their displays, an issue that prompted the cancellation of multiple domestic and international flights. Arlanda, Landvetter and Bromma airports were particularly affected. The Swedish Civil Aviation Administration publicly blamed a solar storm. However, behind the scenes the Swedes were notifying NATO about a serious, ongoing cyber attack, Norwegian news outlet aldrimer.no reports.