Six alleged drug traffickers accused of using “narco subs” and aircraft to transport large quantities of cocaine were slapped with U.S. sanctions earlier this week, according to the U.S. Department of the Treasury’s Office of Foreign Assets Control. 

Two Colombians – Manuel Salazar Gutierrez and Yeison Andres Sanchez Vallejo – and four Guyanese nationals – Randolph Duncan, Himnauth Sawh, Mark Cromwell and Paul Daby Jr. – have been sanctioned for allegedly trafficking tons of cocaine from South America to the United States, Europe and the Caribbean, according to officials. 

“Under President [Donald] Trump, this administration has achieved the most secure border in modern history,” Deputy Secretary Michael Faulkender said in a statement. “The Treasury Department continues to bring our unique tools and authorities to the fight against cartels and their affiliates.” 

U.S. and Guyanese law enforcement seized approximately 5,200 pounds of cocaine from a self-propelled narco sub operating off the coast of Guyana on March 21, 2024. (U.S. Department of Treasury)

In March 2025, a cargo vessel from Guyana was discovered by authorities off the coast of Trinidad and Tobago carrying approximately 400 pounds of cocaine, the Treasury said. The packages were stamped with the Toyota logo, known to be used by the Sinaloa Cartel. 

Last year, U.S. and Guyanese law enforcement seized approximately 5,200 pounds of cocaine from a self-propelled narco sub operating off the coast of Guyana. 

Members of the Technical Investigation Board (CTI) inspect packages with cocaine on a narco submarine seized in Buenaventura, Colombia on March 20, 2021. According to the authorities, it contained several packages of cocaine, was destined for the coasts of Mexico and belonged to an armed group of the dissident FARC guerrillas.  (LUIS ROBAYO/AFP via Getty Images)

The Treasury Department did not immediately respond to Fox News Digital’s request for comment. 

“Treasury will continue to expose the criminal networks that allow for drugs to be trafficked into the United States,” Faulkender said. “[We will] work closely with our law enforcement colleagues and the Government of Guyana to disrupt the cartels wherever they operate.”