According to the FSB, the terrorist attacks were being prepared under the guidance of a Daesh emissary from Syria.
In the course of an initial investigation it was established that "terrorist attacks' plots were organized by the leaders and emissaries of Daesh terrorist group in Syria."
Those detained plotted terrorist attacks on Moscow's transport infrastructure and large marketplaces, the FSB said.
"Members of the terrorist group were detained, including the curator of the preparation of the crime — an emissary of Daesh, an explosive device maker and two would-be suicide bombers."
A laboratory for the production of explosives, IEDs have been found and neutralized on Moscow's outskirts during a special operation.
The group of terrorists detained in the Moscow region comprises 3 nationals of Central Asian states and 1 Russian national.
Later in the day, it became known thar the group included one Russian citizen and three Tajik nationals. A Moscow court has so far authorized arrests for three of the four suspects, all of whom will remain in custody until October 11. All of those three suspects are from Tajikistan. Two of them have admitted their guilt. The FSB has not released any information about the fourth suspect.
Last week, Russian Federal Security Service (FSB) Director Alexander Bortnikov, who chairs Russia's National Antiterrorism Committee (NAC) said that the threat from international terrorist groups, including Daesh, and North Caucasus armed gangs, remains in crowded places. Bortnikov made the statement at a meeting of the committee on counterterrorism protection of facilities and crowded places, facilities of Russian transport infrastructure and measures to improve it.