UNITED NATIONS (Reuters) - Iran's U.N. ambassador denied on Friday reports circulating on the Internet that Tehran's supreme leader, Ayatollah Ali Khamenei, had died. "We checked last night and there is no truth to it," Javad Zarif, Iran's chief envoy to the United Nations, told Reuters about the reports, which first appeared on Web sites on Thursday. The Internet rumors were circulating among traders in energy and other financial markets, but had not moved prices.