Syria’s leader vowed on Sunday to hunt down the perpetrators of violent clashes pitting loyalists of deposed President Bashar al-Assad against the country’s new Islamist rulers and said he would hold to account anyone who overstepped their authority.

Syria's fragile transition from decades of Assad family brutal rule has been greatly shaken with an outburst of sectarian retribution and killings, posing a serious challenge to the new leadership led by Ahmad Sharaa.

A monitoring group says 973 civilians have been killed in revenge attacks against the Alawite sect since Thursday.