Syrian army troops and Shiite fighters loyal to President Bashar al-Assad killed at least 70 people as they captured two southern suburbs of Damascus on Friday, said opposition activists according to Reuters.
The fighters included members of Lebanese Shiite movement Hezbollah and were backed by Syrian army tanks in the assault.
The Damascus suburbs of al-Thiabiya and Husseiniya, a Palestinian refugee camp, were combed after they were overrun, according to sources.
Syria's conflict broke out in March 2011, when peaceful protests calling for political change were met with a massive crackdown on dissent.
It has since developed into an all-out war with many fragmented opposition groups. The ongoing violence has forced millions of people to flee their homes.
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