The U.S. military said it carried out ‘self-defense strikes’ over the weekend. Iran’s military said it had targeted a military base in retaliation for an American strike.

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U.S. Central Command has helped around 70 commercial ships pass through the strait in the last three weeks, an official said.

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The U.S. blockade has intercepted dozens of vessels since mid-April. But a small number of ships with Iranian cargo are still sailing.