A former top military official who issued death sentences for detainees in Damascus’s Sednaya prison has been arrested by Syria’s new administration.

Syria's new rebel-led authorities say supporters of ousted President Bashar al-Assad have killed 14 interior ministry troops in an "ambush" in the west of the country. They say 10 other troops were wounded in the fighting on Tuesday near the Mediterranean port of Tartous, a stronghold of Assad's minority Alawite Muslim sect.

Syria's new authorities launched an operation in a stronghold of ousted president Bashar al-Assad on Thursday, with a war monitor saying three gunmen affiliated with the former government were killed.

Syria's new rulers began an operation in western Tartous province, home to many from ousted leader Bashar Assad's Alawite sect. The killing of 14 police officers the previous day has irked the Islamist-led authorities.