Officers of Squadron 56 “Gualeguaychú” stopped a bus carrying football supporters toward Uruguay at the Puerto Unzué section.[1] The stop took place at kilometre 38 of Ruta Nacional 136.[1] The check was carried out as part of sports-security controls.[1]

Officers first found drug wrappers in the bathroom area, which led them to extend the search to compartments inside the bus.[1] An officer noticed screws at different depths on the air-conditioning housing.[1] Behind the wiring panel officers found a hidden 9mm pistol.[1] The pistol had its magazine fitted with 15 rounds ready to fire.[1] The operation also seized doses of cocaine and marijuana alongside the pistol.[1]

The Federal Court of Gualeguaychú intervened and ordered the seizure of the weapon and drugs for breach of the drugs and arms laws.[1]