ISTANBUL - Iran's semi-official Fars News Agency quoted an "informed source" on Saturday as denying a report that Iran's chief nuclear negotiator Saaed Jalili had accepted a request for a meeting with a US envoy.Another Iranian news agency, ISNA, earlier said a US envoy at the Istanbul talks between Iran and six world powers had requested a meeting with Jalili and that he had accepted.But Fars said its source denied the report and described it as part of a "news wave against the Iranian delegation."Diplomats at the talks in Istanbul also cast doubt on the ISNA report.