MOSCOW, April 6. /TASS/. Russian Security Council Deputy Chairman Dmitry Medvedev has blamed Ukrainian officials for organizing the recent attack on a concert hall outside Moscow.

Reports that the Islamic State terrorist group (banned in Russia) claimed the responsibility for the attack on the Crocus City Hall are just a cover-up, according to the official.

"The real organizers are still hiding in the shadow of the IS," he said on Telegram. "But initial information from the phones of these hired freaks, which was released, gives unambiguous evidence about the nationality of the organizers. Like a lot of other things that are in the open (their exfiltration destination) or as yet undisclosed. They are the officials of the Nazi ‘Ukraine.’ It was their freak brains that gave birth to the idea to make up for failures at the battlefield with terrorist attacks, which, however, is not surprising," Medvedev said.

He warned that these individuals "will have to answer either according to the law or otherwise."

Medvedev also said the attackers weren’t radical Islamists ready to die for their faith, as they didn’t display any religious paraphernalia.

"They are primitive assassins, hired for relatively little money and given some training to use firearms," he wrote.