US forces struck Iranian rocket launchers on the Strait of Hormuz in their first military action in a month on Sunday, breaking a lull in fighting during an intermittent war that has lasted more than six months. Iran swiftly vowed to retaliate for what it called a deadly attack.Forces with the Revolutionary Guard Corps were observed preparing to launch rockets with sea mines into the strait, according to Tim Hawkins, a spokesperson for the US Central Command. The US military last week completed clearing sea mines from the strait’s international shipping routes.Semi-official news outlets in Iran reported sounds of explosions near Larak island on the strait. The Guard in a statement carried by Iran’s state broadcaster noted “the martyrdom and injury of several of our fighters and compatriots”.Later, Iranian state television showed what it said were ballistic missiles being fired by Iran at US bases in Jordan in response to the American strikes. Jordan’s armed forces said they intercepted eight missiles that penetrated the country’s airspace early Monday.A return to open conflict would be dangerous for the region, where Iran has targeted US military bases and infrastructure in Gulf countries since the war began on February 28.The last time the US military confirmed targeting Iran was on July 29, when it announced a “heavy wave of strikes” on dozens of Revolutionary Guard targets including coastal surveillance and defence sites. On August 1, US President Donald Trump said he would order the military to hold off on new strikes at the urging of Gulf allies Qatar, Saudi Arabia and the United Arab Emirates.