A cyberattack led to widespread disruptions at the Russian state-owned broadcaster VGTRK on Monday, according to media reports.

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The online Russian newspaper Gazeta.Ru reported that a pro-Ukrainian hacker group named “sudo rm -RF” was responsible for the attack, citing Russian intelligence officials.

Gazeta.Ru said that the attack affected the online broadcast of the program, internal services, and even the company’s internet and telephone connections.

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The news channel Russia-24 was unavailable online on Monday morning.

Various reports said that the servers were out of action and that important information had been deleted. They also said that it would take a long time to restore the service.

State television has not yet commented on the reports.