Overview

• The security service reports four arrests in Moscow, naming three Russian citizens as alleged accomplices and a Central Asian national as the purported executor.
• The FSB alleges Ukrainian special services coordinated the operation with Islamic State and that IS operative Saidakbar Gulomov remotely directed the attacker.
• Authorities say explosives and components were sent into Russia by unmanned aerial vehicles for a blast planned in a densely populated district.
• Specialists cited by the FSB estimate the device’s lethality at up to 70 meters, and investigators say the plan envisioned the perpetrator’s death during the attack.
• Investigators opened cases for preparing a terrorist act and illegal trafficking of explosives, and the FSB links the detained Russians to prior technical support for Ukrainian call centers.