President Barack Obama today said he has been "appalled and outraged" by the threats, beatings and imprisonments against demonstrators in Iran.
"I strongly condemn these unjust actions, and I join with the American people in mourning each and every innocent life that is lost," Mr Obama said at a news conference.
He called accusations that US was instigating massive protests "patently false and absurd."
Mr Obama said that Tehran had a path to improve ties with the international community.
"We have provided a path whereby Iran can reach out to the international community, engage and become a part of international norms," he said at a news conference.
"It is up to them to make a decision as to whether they choose that path."
He added that what has been seen recently has not been encouraging.
Reuters