Delegates of more than 60 countries are meeting in Istanbul on Sunday to discuss ways of supporting the Syrian opposition.
Foreign ministers from Western and Arab nations want to step up the pressure on the Assad regime to end a deadly one year crackdown that has left ten thousand people dead.
France’s Alain Juppe and US Secretary of State Hillary Clinton will both attend.
Turkish Foreign Minister Ahmet Davutoglu told euronews that the meeting would send an important message to the Syrian people “that the international community is with you in your heroic resistance and that the government must stop using violence.”
The gathering will also debate a peace plan brokered by the United Nations and Arab League’s special envoy Kofi Annan.
President Bashar Assad has said he accepts the plan, which calls for a commitment to halt the bloodshed.
But activists said this footage posted on social media sites on Saturday shows Syrian troops shelling residential areas of Homs.