By JOSHUA GOODMAN and MICHAEL BIESECKER

MIAMI (AP) — The oil tanker was steaming near the coast of Guyana recently when its location transponder showed it starting to zigzag. It was a seemingly improbable maneuver and the latest digital clue that the ship, the Skipper, was trying to obscure its whereabouts and the valuable cargo stored inside its hull: tens of millions of dollars’ worth of illicit crude oil.

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