Russia’s national airline Aeroflot was forced to cancel dozens of flights on Monday after a massive cyber attack caused the company’s computer systems to fail. A hacking group called Silent Crow claimed responsibility for the action, alongside an outfit known as Cyber Partisans.

Aeroflot canceled 54 of its 260 scheduled flights for the day due to the cyber attack, and an undetermined number of others experienced some amount of delay. 22 outbound flights from Moscow were subsequently canceled the following day,

Russia's national airline, Aeroflot, said it had cancelled dozens of flights after pro-Ukrainian hackers claimed an attack on the carrier's IT systems. A statement from hacking group Silent Crow said it carried out the attack with the help of a Belarusian group Cyberpartisans.