EDITOR'S NOTE: Iranian authorities have barred journalists for international news organizations from reporting on the streets and ordered them to stay in their offices. This report is based on the accounts of witnesses reached in Iran and official statements carried on Iranian media.

Iran's hardline president lashed out anew at the United States and President Barack Obama on Saturday, accusing him of interference and suggesting that Washington's stance on Iran's postelection turmoil could imperil Obama's aim of improving relations.

"We are surprised at Mr. Obama," Mahmoud Ahmadinejad said in remarks to judiciary officials broadcast on state television. "Didn't he say that he was after change? Why did he interfere?"

"They keep saying that they want to hold talks with Iran ... but is this the correct way? Definitely, they have made a mistake," Ahmadinejad said.

Obama was strongly criticized at home and by many abroad, for his initial measured response to opposition allegations that Ahmadinejad was re-elected by fraud in the June 12 balloting and to the harsh crackdown on protesters. The Obama administration wants to improve contacts with Tehran, especially because of concern that Iran is developing nuclear weapons, and Obama appeared unwilling to jeopardize that goal with strong statements against Iran's authorities.

But on Friday, he hailed the demonstrators in Iran and condemned the violence against them.

"Their bravery in the face of brutality is a testament to their enduring pursuit of justice," Obama said. "The violence perpetrated against them is outrageous. In spite of the government's efforts to keep the world from bearing witness to that violence, we see it and we condemn it."

In a separate show of defiance of international opinion, Foreign Ministry spokesman Hasan Qashqavi was quoted by the official news agency IRNA as accusing the Group of Eight countries — including the United States — of "intervening and hasty remarks." G-8 foreign ministers on Friday called for an end to the violence in Iran and urged the authorities to find a peaceful solution.

The Foreign Ministry also summoned Sweden's ambassador to protest a break-in by demonstrators at Iran's embassy on Friday, IRNA reported

Meanwhile, opposition supporters, faced with a senior cleric's demand that protest leaders be severely punished or even executed, enter the third week of their campaign against the election results in increasingly tight straits.

Opposition leader Mir Hossein Mousavi, who claims Ahmadinejad stole the election, says he will seek official permission for any future rallies, effectively ending his role in street protests.