Deutsche Lufthansa AG has grounded all of its flights because of company computer issues.

A Lufthansa spokesman said on Feb 15 the company is urgently investigating the matter. It wasn’t immediately clear whether Lufthansa flights that were already airborne were instructed to land.

Lufthansa’s stable of airlines includes its namesake brand and the national flag-carriers Austrian Airlines, Brussels Airlines and Swiss. The company also operates low-cost carrier Eurowings as well as other smaller airlines. In total, the group operates around 700 aircraft, making it Europe’s largest airline by fleet size.

The spokesman said it’s too early to say whether Lufthansa’s IT issues are linked to a cyberattack targeting Scandinavian airline SAS AB this week.

Lufthansa fell as much as 2.3% in Frankfurt.

 - Bloomberg