Skyguide

This was announced by the Swiss agency that provides Skyguide air navigation services.
A statement from Skyguide states that the Swiss airspace was closed to traffic until further notice due to security reasons due to a technical malfunction that occurred this morning in this agency.

Switzerland closed its airspace on Wednesday after a computer glitch with the air traffic control system grounded flights, officials said.

"Swiss airspace is closed to traffic for security reasons after computer failure with Skyguide, the Swiss air traffic control service," Skyguide said in a statement.

Starting on March 30, the Bulgarian Air Traffic Services Authority (BULATSA), together with the air navigation services providers of Romania, ROMATSA and Hungary, HungaroControl, expand the Free Route Airspace for flights during the night within the three countries' airspace, BULATSA said in a press release on Thursday, cited by BTA.