MOSCOW, October 13 (RAPSI) – Three people are suspected of planning a terror attack in Moscow, their accomplices are not identified yet, the Lefortovsky District court announced on Tuesday.

All three suspects have been detained until December 12.

The Federal Security Service (FSB) chief, Alexander Bortnikov, has previously announced that the alleged mastermind behind the planned attack has come to Russia from Syria.

Earlier it was reported that FSB has arrested a group of alleged terrorists who planned to organize an explosion at Moscow public transport. Investigators believe that terrorists attempted to intimidate Russian authorities to stop military operation against the Islamic State forces in Syria.

Some of the suspects were training in the Islamic State military camps but came to Russia long before the start of Russian operation in Syria.