Nineteen people, including 12 army personnel were involved in the trafficking of ammunition and explosives via postal service, Army Commander-in-Chief General Chalermchai Sitthisart said on Tuesday.
However, he added that none of them were linked to the three bomb blasts in Bangkok, which were suspected to be politically motivated.
Sgt Thanakorn Boonkarn, an officer attached to the arms depot of the First Engineering Battalion of the Royal Guards, was named the key figure in the illegal arms trade via postal service.
It was reported that Thanakorn used Facebook and Line to sell explosives and ammunition and delivered the good to customers through postal service.
The army chief said the recent seizure of a sizeable cache of war weapons smuggled into the country from Cambodia and to be sold to ethnic groups in Myanmar was also not connected with Bangkok's bomb explosions.
But he stressed that army personnel involved in the illegal trade in firearms would be punished.
Source: Thai Public Broadcasting Service (Thai PBS)