Syria’s opposition National Coalition on Saturday rejected an Iranian offer to broker talks with the regime, saying the bid was "not serious" and accusing Tehran of "being part of the problem."

Syria's opposition National Coalition on Saturday rejected an Iranian offer to broker talks with the regime, saying the bid was "not serious" and accusing Tehran of "being part of the problem."

"The Iranian initiative is not serious and lacks political credibility," the key opposition grouping said in a statement posted online.

The statement described Iranian President Sheikh Hasan Rouhani's offer as "a desperate attempt to prolong the crisis and increase its aggravation to cover very complex files such as Iran's nuclear program" and what the coalition called "supporting terrorism."

The comments came after Sheikh Rouhani said Thursday that his government was willing to "facilitate dialogue" between the Syrian government and opposition fighters.

"We must join hands to constructively work toward national dialogue, whether in Syria or Bahrain. We must create an atmosphere where peoples of the region can decide their own fates," Rouhani wrote in a column in The Washington Post.

But the Syrian opposition said it was skeptical that Iran could broker talks,

Rouhani, a moderate on Iran's political scene, has made several diplomatic overtures since his election in June, and there has been speculation that he could meet US President Barack Obama on the sidelines of the UN General Assembly next week.