Six accused drug traffickers allegedly using boats and "narco subs" to traffic cocaine were hit with U.S. sanctions, the U.S. Department of the Treasury's Office of Foreign Assets Control said Thursday.

Four Guyanese nationals — Paul Daby Jr., Randolph Duncan, Mark Cromwell, Himnauth Sawh — and two Colombians — Yeison Andres Sanchez Vallejo and Manuel Salazar Gutierrez — were sanctioned for allegedly trafficking tons of cocaine from South America to the United States, Europe and the Caribbean, officials said.

Daby Jr. and Duncan operate the largest drug trafficking operation in Guayana, according to U.S. officials, using " narco subs " — a semi-submersible vessel that can't fully go underwater — airstrips and various individuals in their smuggling efforts. Daby Jr. also transports

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