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A closure of the strait could temporarily cut off some oil supplies and force shippers to take longer, more expensive routes that would drive oil prices higher. It also potentially opens the door for a military confrontation that would further rattle global oil markets.

Iran claimed a victory this month when it captured an American surveillance drone almost intact. It went public with its possession of the RQ-170 Sentinel to trumpet the downing as a feat of Iran’s military in a complicated technological and intelligence battle with the U.S.

American officials have said that U.S. intelligence assessments indicate the drone malfunctioned.

Additional reporting from Adam Schreck in Dubai, UAE.