"Following the consideration of the appeal of lawmakers of the State Duma [...] concerning the need to investigate the organization, financing and conduct of terrorist acts by the United States, Ukraine and other Western countries directed against Russia, in the central office of the Investigative Committee has launched a probe into the matter," the Russian Investigative Committee said on Telegram.
The investigation will carefully study the submitted data and make a procedural decision on the mater, the statement reads.
On March 22, several armed men broke into the Crocus City Hall and started shooting at people. They also started a fire in one of the chambers, full of people ahead of a concert. The attack left 695 casualties, including 144 deaths, according to the latest data from the Russian Emergencies Ministry.
The four main suspects in the case — all citizens of Tajikistan — tried to flee the scene in a car, but were detained and charged with terrorism. Russian authorities believe their plan was to flee to Ukraine, where the masterminds of the attack had arranged a safe haven for them. The investigation is ongoing.