Iran has asked the United Nations to call a meeting to consider banning attacks on nuclear installations, the semi-official Fars news agency reported. Israel has said it will not tolerate a nuclear Iran and has dropped hints about taking military action against Iran’s enrichment facilities if diplomatic efforts fail to halt the nuclear program. Iran has said its program is purely civilian in nature and cites its right to nuclear power under the Nuclear Nonproliferation Treaty. Tehran’s request, which asked for a conference of 150 nations to vote on a proposed ban, was made on Wednesday in a letter by Iran’s envoy to the International Atomic Energy Agency, Ali-Asghar Soltaniyeh, according to Fars. Mr. Soltaniyeh asked that Iran’s proposal be considered at the scheduled September meeting of the nuclear agency’s general conference.