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The United States military’s crackdown on narco-trafficking routes in the southern Caribbean in the past four months has hampered boat-borne narcotics supplies from Venezuela to Trinidad.

But senior intelligence sources say the interruption has only prompted traffickers to adapt.

According to well-placed sources familiar with US operations, the port city of Guiria in Venezuela has emerged as a crucial staging site, with traffickers stepping up efforts to transport illicit commodities from the Venezuelan coast to Trinidad.