Russian state-owned flagship carrier Aeroflot suffered a mass IT outage Monday following a cyberattack, Russia’s prosecutor’s office said, forcing the airline to cancel more than 100 flights and delay others.

Footage shared on social media showed hundreds of delayed passengers crowding Moscow’s Sheremetyevo airport, where Aeroflot is based. The outage also disrupted flights operated by Aeroflot’s subsidiaries, Rossiya and Pobeda.

While most of the flights affected were domestic, the disruption also led to cancellations for some international flights to Belarus , Armenia and Uzbekistan.

In a statement released early Monday, Aeroflot warned passengers that the company’s IT system was experiencing unspecified difficulties and that disruption could follow.

Russia’s Prosecutor’s Office late

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