Ebrahim Raisi's comments, the first since Tuesday's attack, did not blame anyone specifically for the incident.
The annual SCO summit is expected to deliberate extensively on the developments in Afghanistan as well as the overall regional security scenario.
On Tuesday the IAEA said its monitoring at Iranian nuclear sites had been "seriously undermined" by Tehran's suspension of some inspections since February.
Iranian President Ebrahim Raisi said he is opposed to the creation of insecurity in the region, adding: "The presence of Americans in the region, including Afghanistan, has not provided security."
France, alongside the U.S., Germany, Britain, Russia, and China, was part of the original 2015 nuclear agreement and has played a prominent role as intermediary.
“Tehran welcomes New Delhi’s role in the establishment of security in Afghanistan.
The former judiciary chief known for his distrust of the West takes the reins at a tense time.
Raisi replaces moderate president Hassan Rouhani, whose landmark achievement was the 2015 nuclear agreement between Iran and six major powers.
Rouhani's comments come as officials in his government have appeared rudderless in recent months amid a series of crises ranging from the coronavirus pandemic to drought-fuelled public protests.
A sixth round of nuclear talks ended last month without agreement. The U.S. has repeatedly said it is ready for a seventh round as soon as Iran is ready.
Jaishankar hands over personal message from PM Modi to Iran's President-elect Raisi during stopover in Tehran
Prime Minister Modi last month congratulated President-elect Raisi and said he looked forward to working with him to further strengthen the warm ties between India and Iran.
Abu Alaa al-Walae said that the electoral victory of Iran’s hard-line judiciary chief Ebrahim Raisi as president will strengthen Iran-backed militant groups throughout the Middle East.
Raisi is backed by the Islamic hardliner lobby, including the powerful Revolutionary Guards which was unhappy with the relatively moderate and pragmatic Rouhani.
Iran's outgoing moderate President Hassan Rouhani said his successor had been elected in the previous day's vote, without naming the widely expected winner, Raisi.