On 13–14 December 2017, Russian security authorities arrested seven members of an ISIL terrorist cell during a police operation in St. Petersburg.
[1] Both the United States Central Intelligence Agency (CIA) and the Russian Federal Security Service (FSB) were involved in the operation.
In August 2017, a single terrorist organized a series of attacks, including mass killings and arson, in the center of Surgut.
[2] Three days earlier the FSB had arrested three suspected members of a similar group in Moscow, where they were allegedly plotting attacks during the New Year holidays and the upcoming presidential campaign.
[citation needed] According to a statement, a "large number of explosives used to make homemade bombs, automatic rifles, munitions and extremist literature" were seized during a police operation on 13 and 14 December.