WRAPUP 9-Trump puts sanctions on Iranian supreme leader, other top officials

WASHINGTON/RIYADH, June 24 (Reuters) - U.S. President Donald Trump targeted Iranian Supreme Leader Ayatollah Ali Khamenei and other top Iranian officials with sanctions on Monday, taking a dramatic, unprecedented step to increase pressure on Iran after Tehran's downing of an unmanned American drone. With tensions running high between the two countries, Trump signed an executive order imposing the sanctions, which U.S. Treasury Secretary Steven Mnuchin said would lock billions of dollars more in Iranian assets.