Iran targeted US radar and air defence installations in the Gulf on Tuesday, warning Washington of “more decisive and powerful” attacks to come as the conflict threatened to widen with a blockade of Saudi ports by Houthi rebels in Yemen. Iran’s Revolutionary Guards said they had attacked and stopped two “non-compliant oil tankers” attempting to transit the Strait of Hormuz, part of an effort to tighten its grip on the vital waterway while the war reignited. Following the deaths of at least three...