"Four members of the terrorist group were detained" during raids today, the FSB security service said in a statement.
"The militants were preparing the terrorist attacks on direct orders of a Turkey-based emissary of the Islamic State international terrorist organisation, who has been put on an international wanted list by Tajikistan," the statement said.
The FSB did not identify the suspect in question but said the four people detained were citizens of Tajikistan and Moldova.
The group was "planning to carry out a series of high-profile terrorist attacks in Moscow using powerful homemade explosive devices."
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During the raid, police seized firearms and ammunition as well as "homemade explosive devices and a large amount of explosive blend material for making a high-energy explosive device."
Moscow launched a bombing campaign in Syria last year in what it claimed was an attempt to prevent terror attacks in Russia.
The Russian defence ministry told local media Thursday that more than 2,000 jihadists from Russia and other former Soviet republics were killed in Syria last year.
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