"Any party who refuses to condemn these attacks today we will consider that party to be an accomplice of terrorism," Bashar al-Jaafari said after his latest meeting with UN mediator Staffan de Mistura, who he said should also condemn the attacks.
"What happened today has cast a shadow over Geneva", he added, saying it was "not only a military terrorist attack it was also a political attack".
"What happened today will not go unnoticed and we will react to it...The blood of Syrians is precious and those who kill Syrians will also be punished," he added.
Syria's former Al-Qaeda affiliate Fateh al-Sham Front claimed the spectacular assault which targeted and killed General Hassan Daabul, a close confidant of President Bashar al-Assad.
The Syrian Observatory for Human Rights said 42 people were killed when the bombers targeted the headquarters of state security and military intelligence in the heavily guarded Ghouta and Mahatta neighbourhoods.
Provincial governor Talal Barazi said 30 people were killed and 24 wounded.
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