DUBAI, United Arab Emirates — Iran fired missiles at targets in Israel and Gulf Arab states Sunday after vowing massive retaliation for the killing of Supreme Leader Ayatollah Ali Khamenei by the United States and Israel, prompting US President Donald Trump to threaten Tehran against further escalation. Iran acknowledged 86-year-old Khamenei’s death in the joint Israeli-American airstrike Saturday at his Tehran office, which has thrown the future of the Islamic Republic into question and raised the risk of regional instability. “This is the single greatest chance for the Iranian people to take back their country,” Trump said. READ: What will […]... Keep on reading: Iran fires missiles at Israel, Gulf states after US-Israeli strike kills Khamenei