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Investigators are conducting a criminal investigation into murder, terrorist acts, and the illegal circulation of weapons and ammunition "in connection with the death of two servicemen in the capital," the committee said in a statement.
Earlier in the day, Lieutenant General Igor Kirillov, head of the Russian Armed Forces' radiological, chemical and biological defense troops, and his assistant were killed by an explosion in a residential building in Moscow.
The committee had previously said it opened a criminal case, adding the blast occurred after the detonation of an explosive device planted in a scooter parked next to the entrance of the residential building.
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Lieutenant General Igor Kirillov, head of the Russian Armed Forces' radiological, chemical and biological defense troops was killed by an explosion in a residential building in Moscow.
Xinhua