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Iran can’t count on the world community turning a blind eye,” she said through a translator. Mr. Obama nodded as he listened to the translation.

Mrs. Merkel called the pictures and videos “horrifying scenes” of violence.

“We will not forget this. And let me say that we shall do everything in order to identify the exact number of victims, who those victims were, and how they dealt with those demonstrators,” she said.

Mr. Obama, Mrs. Merkel and the leaders of China, Russia, Britain and France have spent years trying to get Iran to forgo a nuclear weapons program. Mr. Obama took office promising to pursue direct negotiations with Iran if it would help.

But on Friday the president said prospects for diplomacy have changed.

“There is no doubt that any direct dialogue or diplomacy with Iran is going to be affected by the events of the last several weeks. And we don’t yet know how any potential dialogue will have been affected until we see what’s happened inside of Iran,” he said.

While other leaders have been more out front in their criticism, Mr. Obama has taken pains not to appear to meddle in the debate on the actual election results, arguing he doesn’t want his words to become propaganda for the Iranian regime.

“Only I’m the president of the United States, and I’ve got responsibilities in making certain that we are continually advancing our national security interests and that we are not used as a tool to be exploited by other countries,” he said at a press conference Tuesday.