
Mexico has disbanded an elite anti-narcotics unit, which for a quarter of a century has worked side by side with the American Drug Enforcement Administration (DEA) to fight organized crime, two sources told Reuters.
The decision is a major blow to security co-operation between the US and Mexico.
The elite group was one of the Sensitive Investigation Units (SIU) operating in about 15 countries, which U.S. officials describe as invaluable in dismantling powerful smuggling rings and destroying countless drug bosses around the globe. The units are trained by the DEA, but are under the control of national governments.
In Mexico, over 50 officers in the SIU police unit were considered many of the country's best and worked on the biggest cases as the 2016 capture of Joaquin "El Chapu" Guzman, then the boss of the powerful Sinaloa cartel.
The shutdown threatens to jeopardize U.S. efforts to fight organized crime groups within Mexico, one of the epicentres of the multibillion-dollar global narcotics trade, and make it harder to apprehend and prosecute cartel executives.
The government of President Andres Manuel Lopez Obrador officially notified the DEA in April last year that the unit had been closed, according to a DEA agent with knowledge of the matter.