Iran will not attempt to block off the Straits until its defeat is imminent, for two reasons. #1 even the mullahs are not delusional enough to think they can withstand an attack by the USA/Israel. #2 Iran exports crude, but does not produce refined product (petrol or deisel). Thus blocking the Straits cuts off their own supplies as well. The Persian people will rise and hang the mullahs from their beards for defiling Islam to enrich themselves.
2 Yemeni Red Cross workers killed by gunmen (AP)