RIA Novosti reported this with reference to a message from the special service.

It is noted that the terrorists planning the attack were neutralized in the Kaluga region. 

According to the FSB, we are talking about members of a cell of the international terrorist organization "Islamic State"* banned in Russia in Afghanistan - "Vilayat Khorasan".

On March 7, the Federal Security Service of Russia also prevented a terrorist attack by the Ukrainian special services in Karelia with the participation of a recruited citizen of Belarus.

According to the FSB, the criminal, on the instructions of his handlers from Ukraine, planned to blow up one of the administrative buildings in the city of Olonets. 

* “Islamic State” (IS, ISIS) is an organization recognized as terrorist by the decision of the Supreme Court of the Russian Federation dated December 29, 2014.