VIENNA, AUSTRIA, MAY 17, SPA -- A TOP-LEVEL, SIX-NATION MEETING ON IRAN HAS BEEN POSTPONED WHILE THE UNITED STATES LOBBIES OTHER U.N. SECURITY COUNCIL PERMANENT MEMBERS TO HARDEN PROPOSED PENALTIES IF TEHRAN DOES NOT GIVE UP URANIUM ENRICHMENT, DIPLOMATS SAID WEDNESDAY. THE LONDON MEETING OF SENIOR REPRESENTATIVES FROM THE FIVE PERMANENT COUNCIL MEMBERS AND GERMANY WAS TO HAVE BEEN HELD FRIDAY. BUT DIPLOMATS TOLD THE ASSOCIATED PRESS THAT IT HAD BEEN MOVED TO TUESDAY OR WEDNESDAY TO ALLOW MORE TIME FOR PHONE DISCUSSIONS ON WHAT SHOULD BE INCLUDED IN A PACKAGEOF INCENTIVES AND PENALTIES TO BE OFFERED TO TEHRAN, ADIPLOMAT SAID. --SPA www.spa.gov.sa/361707