The Federal Security Service has detained a group of illegal gunmakers, seizing three aircraft guns and a large amount of weapons, the press service said.

The criminal group "supplied, sold and manufactured firearms in underground workshops on the territory of the Central Federal District."

The FSB officers seized 56 pieces of firearms made in Russia and abroad, 15 kg of explosives, 10 grenades, 2 mortar shells, 10 detonators, more than 3,700 rounds of ammunition and 68 pieces of cold weapons.

Four illegal workshops for upgrading weapons and manufacturing rounds of ammunition have been shut down. A criminal investigation has been launched into ammunition trafficking and manufacturing.