"An address was located in Moscow where 6 to 11 persons periodically stayed, some of whom had received military training in Islamic State camps in Syria," the statement reads.
They planned to commit a terror attack in the Russian capital's public transportation, the service added.
"During the interrogation of two detainees it soon became known that they planned to carry out a terrorist attack on public transport in Moscow. Bandit underground provided them with money and gave them improvised explosive devices to organize and carry out a terror attack."
On Sunday, the Russian National Counter-Terrorism Committee said in a statement that a group of people involved in plotting a terror attack in Moscow had been arrested, an improvised explosive device had been located and defused.