US Central Command said the American strikes, against Iranian missile and drone storage sites and coastal radar positions, were a response to "unwarranted aggression against commercial shipping by Iranian forces" that "clearly violated the ceasefire."It described the operation as "a powerful response to yesterday's attack on a commercial ship that was transiting the Strait of Hormuz."Iranian state television, citing a reporter in Sirik, said an explosion was heard late Friday at Taherouyeh pier in the southern port city. It quoted an informed military source as saying the blast was caused by a projectile impact in the area.US President Donald Trump had earlier denounced what he described as an Iranian drone strike on the vessel, saying: "Obviously, this is a foolish violation of our ceasefire agreement."Vice President JD Vance issued a direct warning, posting on X that "violence will be met with violence" if Iran carries out any further attacks. Minutes later, on Saturday morning Iran time, state television reported that the Revolutionary Guards said they targeted US sites in the Gulf region in retaliation for the American strikes."If the aggression is repeated, our response will be broader than this," the Guards said, according to a post by state TV on Telegram.The exchanges raised fresh questions about efforts to keep the Strait of Hormuz open while Washington and Tehran negotiate a final settlement to a war that began February 28 with US and Israeli strikes on Iran.Iran has warned vessels not to enter or leave the Gulf through the strait without permission, but ships have continued to move, some using a route not authorized by Tehran.Around half of the 42 vessels that made the passage Thursday used a non-approved southern route along Oman's coast, according to tracking platform Kpler.The UN maritime agency said an evacuation operation had freed 115 vessels and 2,500 seafarers trapped by the dispute before the attack forced its suspension.Oil prices nevertheless fell sharply, reflecting hopes that traffic through Hormuz -- a strategic waterway which normally sees around a fifth of the world's oil and gas exports -- would keep recovering despite the latest flare-up.Lebanon frameworkIsrael and Lebanon hailed an agreement signed with the US to pave a way towards peace on their front in the war, although Iran-backed Hezbollah warned the deal would thwart plans to resolve the broader conflict.At a Washington signing ceremony, Secretary of State Marco Rubio, flanked by Israeli and Lebanese envoys, said the trilateral accord "begins to put in place a framework for lasting peace and security.""It's the beginning of the beginning. There's a lot of work ahead," he said.Israeli Prime Minister Benjamin Netanyahu welcomed the framework as a victory against Iran, which argues the Lebanon front is inseparable from the wider war and should be resolved as part of US-Iran talks.