State news agency TASS reported the new details on Saturday, August 16.
The main suspects have been identified as Dalerjon Mirzoyev, 32; Faridun Shamsiddin, 26; Muhammadsobir Fayzov, 19; and Murodali Rachabalizoda, 30, all citizens of Tajikistan.
Investigators previously revealed that one of the suspects had travelled to Afghanistan on a forged passport before the assault, where he allegedly underwent training.
The Islamic State affiliate in Afghanistan, known as ISIS-K, has claimed responsibility for the Crocus City Hall attack, which authorities have described as one of the group’s largest operations in the region.