The UN Human Rights Council will hold an emergency session on Monday, August 22, on the violence in Syria after 24 countries, including all four Arab members - Jordan, Kuwait, Qatar and Saudi Arabia - backed the European Union's call for action.

The United States, which along with the EU is expected to call for Syrian President Bashar al-Assad to leave power, according to Washington sources, was also among members endorsing the special session, Reuters reported citing a UN statement.

The United Nations Human Rights Council held a first special session on Syria on April 29, early on during the crackdown by security forces on pro-democracy protesters.

The 47-member forum launched an inquiry into human rights violations at the time and the report by UN investigators who went to the region is to be issued later on Thursday by the office of UN High Commissioner for Human Rights Navi Pillay.

The report and session are expected to add pressure on Assad whose government has engaged in a crackdown against protesters seeking an end to his rule.