Conflict has spread across the Middle East after Iran's Supreme Leader, Ayatollah Ali Khamenei, was killed during strikes launched by the US and Israel on Saturday. Iran has responded by launching missiles and drones across the region, targeting Israel, Bahrain, Kuwait, Qatar, the United Arab Emirates, Jordan, Saudi Arabia, Cyprus and ships passing through the Strait of Hormuz. The BBC's Security Correspondent Frank Gardner answers your top questions on the escalating war in the Middle East -