The United States says the five permanent members of the UN Security Council have made rapid progress on a new agreement to curb Iran's nuclear program.
A US State Department spokesman Tom Casey says Britain, China, France, Russia and the United States hope to finish a draft resolution during a conference call on Saturday. Although he would not discuss the contents of the pending measure, he said he thinks it will be a substantive resolution.
Officials say the draft resolution for consideration by the entire 15-member Security Council is expected next week.
Iran ignored a UN Security Council deadline last week to suspend uranium enrichment or face new UN sanctions, in addition to those imposed in December.
The United States and its Western allies suspect Iran is working to develop nuclear weapons, a charge Tehran denies.
Diplomats have said the new measure could include travel bans on key Iranians, tighter controls on high-technology exports to Iran, and broader curbs on trade credits.