The Arab League has postponed a meeting of foreign ministers that had been scheduled for Sunday in Jeddah, Saudi Arabia to discuss the Syrian situation and a replacement for peace envoy Kofi Annan, who resigned earlier this month.

An Arab League official who announced the postponement Sunday did not give a reason for the delay and did not say when the meeting might be rescheduled.

The announcement came while U.S. Secretary of State Hillary Clinton is in Istanbul to discuss Syria with Turkish leaders

Officials say Clinton is meeting with President Abdullah Gul, Prime Minister Recep Tayyip Erdogan and other Turkish officials to discuss how to deal with neighboring Syria. Turkey is hosting tens of thousands of Syrians who have fled the violence in their home country.

The U.S. Treasury's top official on terrorism and financial intelligence, David Cohen, told reporters Friday that Washington will be tightening existing sanctions on Syria and adding new ones. Cohen accused Hezbollah and Iran of aiding in the suppression of the Syrian people.

Cohen is traveling with Secretary Clinton.

A senior state department official told reporters Friday that one of the key things on Clinton's agenda in Turkey is to compare notes with the Turks so she can sharpen her operational picture on what is happening on the ground in regard to the conflict in Syria.