Speaking to CNN, Gene Seroka said the war involving Iran has doubled ship fuel costs, pushing up trade expenses and ultimately consumer prices.
He said bunker fuel prices have surged sharply since the conflict began, with shipping companies passing those costs on through higher freight rates.
Seroka said the disruption, now lasting about six weeks, has also caused congestion at major Asian ports as cargo bound for the Middle East stalls or is rerouted.
He warned that prolonged disruption could further strain global supply chains, even as some trade routes remain operational.
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