Assad's five-month campaign against street protests has emerged as one of the bloodiest episodes of the wave of democratic revolutions sweeping the Arab world this year. Killings have worsened sharply in the past week after Assad ordered tank assaults on two cities.

Other Arab leaders had been cautious about criticizing one of their peers, but Saudi Arabia's King Abdullah broke the silence with a rare intervention overnight, demanding an end to the bloodshed and recalling the Saudi ambassador from Damascus.

Hours later Kuwait and Bahrain recalled their envoys too.

Syrian tanks and troops poured into the eastern Sunni city of Deir al-Zor in the latest stage of a campaign to crush centers of protest against 41 years of Assad family rule.

Later on August 8 Assad fired defense minister Ali Habib and replaced him with chief of staff General Daoud Rajha. The state news agency said Habib was ill. Habib had been added to an EU sanctions list last week for his role in crushing protests.

Syria's military is effectively under the command of Assad's brother Maher. Many officers are from the Assad family's minority Alawite sect.