A gang of fake postal workers dedicated to robbing retirees was dismantled following violent incidents at homes in the Buenos Aires towns of Quilmes, Lomas de Zamora, and Almirante Brown. The men carried firearms and moved in stolen cars. Undercover agents patiently waited until one of them left in a stolen gray Toyota Etios, and they immediately detained him. In his vehicle, the officers found large screwdrivers, gloves, a balaclava, cash, and, most disturbingly, two jars of veterinary tranquilizers (ACEDAN), a substance that at high doses causes immobility and loss of consciousness.
The police investigation continued with the interception of a Peugeot 408 at Cerrito and Dardo Rocha, Quilmes. It was established that the gang rotated the cars among its members to mislead the authorities and avoid being tracked. In the case of the Peugeot 408, investigators not only identified its occupants, but follow-ups led them to a hidden crime hideout in the dangerous Villa Itatí, where the presence of brothers Guillermo and Roberto Monzón, criminals with extensive criminal records, was detected.
On January 31, the plot took a shocking turn. Monzón was shot three times but without serious injuries and was taken to the Second Police Station of Quilmes (Bernal). Meanwhile, on February 3, the judiciary issued four search warrants and three arrest warrants. The police set up a covert operation to locate the main suspects. This led to Tarsia falling into an ambush organized near a motel in Quilmes. His driver, Martín Ezequiel Acosta, turned out to be a repeat offender wanted for a brutal assault on an elderly couple in Bernal. His capture allowed for the recovery of cash, cell phones, and pepper spray, items that they used in their attacks.
Finally, in a lockdown operation in Villa Itatí, agents raided the homes of the implicated and detained Roberto Monzón and Uriel Tomás Pereira, the latter of whom was found with a firearm. The discovery of powerful tranquilizers in the possession of the criminals raised alarms for the investigators. There is suspicion that the gang may also be linked to robberies under the "Black Widow" modality, using women to drug and rob their victims after contacting them on social media or dating apps. Moreover, all those involved have criminal records. One of the brutal security episodes that shook Quilmes on December 10, 2024, led to a complex investigation that has now ended with five arrests.
The criminal act that gave rise to the legal case occurred when an elderly woman, living alone, became a victim of a violent "entradera," where at least three criminals, disguised as employees of the Argentinian Post, burst into her home with firearms, threatened her, and stole her savings. This criminal attack was perpetrated by an organized crime group operating in the southern and western areas of the Greater Buenos Aires region. Officers from the Directorate for Investigations Against Organized Crime managed to reconstruct the gang's movements through security camera footage and images from monitoring centers (COM) in Quilmes, Lomas de Zamora, and Almirante Brown, which made it possible to identify the vehicles used in the first robbery: a metallic blue Peugeot 208 and a white Peugeot 408.
From the investigation, judicial sources indicated: "The tracking of the vehicles revealed that the Peugeot 208 had stolen plates and had been taken in Ciudad Evita on November 4, 2024." The driver was identified as Mauro Nicolás Tarsia, a key player in the criminal structure. Guillermo Monzón was captured after a fierce shootout with the Multiple Procedures Group (GPM) of Quilmes. He had a S&W .357 caliber revolver, one of the stolen weapons from the home invasion.
