The US and Iran launched new attacks in the Gulf on Monday as they wrestled for control over the Strait of Hormuz with duelling maritime blockades, shaking a fragile truce. The fresh volleys of missiles and drones came after U.S. President Donald Trump launched a new effort to get stranded tankers and other ships through the strait, the vital energy-trade chokepoint that has been virtually closed since the U.S. and Israel began attacks on Iran in February, a war that has killed thousands of peo