Three of 11 vessels chartered by Chevron were Thursday transporting oil from Venezuela to the US, according to an AFP analysis of ship-tracking data, as export sanctions raised concerns over the South American country's storage capacity.

Two more of the tankers were anchored at Bajo Grande refinery port, western Venezuela, while the remaining six were on their way to the South American country, according to ship-tracking data collated by Bloomberg and trade information platform Kpler.

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