Four masked men armed with two rifles, a revolver and a ...

Four masked men armed with two rifles, a revolver and a hammer, attempted to rob an express mail agency. After a dispute with the owner, the perpetrators left the scene. It is suspected that during the dispute with the perpetrators, the agency owner exposed a revolver to threaten them. The police seized the revolver, and are investigating the case. The perpetrators (aged 31, 32, 27 and 21) were arrested and a pistol, two magazines and four cartridges were seized.