A fragile ceasefire between the United States and Iran appeared to hold Saturday despite fresh military escalation in the Strait of Hormuz, as Bahrain announced the arrest of dozens of people allegedly linked to Iran’s powerful Revolutionary Guard, and Britain moved a warship toward the region. News agency Associated Press reported that the latest tensions erupted after the US military said it disabled two Iranian oil tankers accused of trying to breach Washington’s blockade of Iranian ports. Hours earlier, the US said it had thwarted attacks on three Navy ships and launched strikes on Iranian military positions in the Strait of Hormuz. The developments have raised new doubts over the month-old ceasefire that Washington insists remains in effect, even as diplomatic efforts continue behind the scenes to reopen one of the world’s most critical oil shipping lanes.…