
He did not explain what he meant by "proxy" groups but vowed that Turkey would "continue to support the Syrian government's fight against terrorism".
The Damascus government blamed Sunday night's shooting and suicide attack -- the first of its kind in the Syrian capital since the fall of strongman Bashar al-Assad six months ago -- on Islamic State (IS) group militants.
It cast the attack as a bid to "undermine national coexistence and to destabilise the country", which only began emerging from the post-civil war chaos after Assad's ouster six months ago.
Turkey was a key backer of the HTS rebels who ousted Assad under the leadership of Ahmed al-Sharaa, now the interim president, and has repeatedly offered its operational and military to fight IS and other militant threats.