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.

A cyberattack on Russian state-owned flagship carrier Aeroflot caused a mass outage to the company's computer systems on Monday, Russia’s prosecutor’s office said, forcing the airline to cancel more than 100 flights and delay others.

The Kremlin said the situation was worrying and prosecutors confirmed the disruption was the result of a hack and opened a criminal investigation.