Colombian National Police arrested Luis Saúl Pérez Nieto, alias Nairobi, in Bogotá, identified as a top Tren de Aragua leader in Peru. The operation added another link to a network authorities say spans routes across South and Central America. Pérez Nieto, also known as Páez, was taken into custody on August 27, 2026, in Fontibón, Bogotá, after a seven-month joint investigation. Peruvian and Colombian investigators worked with the DEA, using the Peruvian National Police Sensitive Investigative Unit against Transnational Organized Crime, along with its Colombian counterparts. Police said Nairobi was a trusted associate of deceased Tren de Aragua leader Héctor Guerrero Flores, alias Niño Guerrero. He was identified as connected to extortion, international arms trafficking, targeted killings, and drug trafficking. Authorities said he was wanted in the United States on charges related to terrorism, money laundering, drug trafficking, and criminal conspiracy. The case also showed how investigators build cases across borders, starting with information sharing, then moving to more formal state-to-state processes for judicial action, extraditions, and other steps. Regional cooperation efforts cited in the reporting included INTERPOL and AMERIPOL, with Tren de Aragua listed as a 2026 priority. Investigators also described how capturing a high-value suspect can open new leads. Holding a detainee can generate information that investigators then corroborate to map financial networks, routes, international contacts, and command structures. In the hours around Nairobi’s arrest, Colombia transferred Alfredo Camilo Carrillo Ortiz, alias Gocho, to Chile, and another defendant, Rafael Gámez Salas, alias El Turko, arrived in Chile from the United States. Nairobi remains under arrest following his capture in Bogotá on August 27, 2026, as investigations continue around the wider Tren de Aragua network.