On Tuesday, UN Special Envoy for Syria Staffan de Mistura held a meeting with the Syrian government delegation.
"We are waiting. Nothing is clear yet. The meeting day's agenda is still unclear. We are at the stage of preparations for the talks," Jaafari told reporters.
He added that the Syrian opposition delegation has not been formed which impedes the start of the intra-Syrian talks.
"We have discussed with [Staffan] de Mistura a statement by the UNSC, which condemns the three terrorist acts that took place in Syria and killed dozens of innocent people," Jaafari said.
"Now we would want to hear comments from the other side on these terrorist acts. We are expecting them to make a statement that condemns these terrorist acts," Jaafari stressed.
At least 70 people were killed and some 100 injured in three blasts near a Shiite shrine in the Sayyidah Zaynab on the southern outskirts of Damascus on Sunday.