President Obama, meanwhile, has released a videotaped appeal to the people of Iran. In a message timed to coincide with the Iranian holiday of Nowruz, Obama said he is prepared to meet with Iranian leaders.

President Obama: “My administration is now committed to diplomacy that addresses the full range of issues before us and to pursuing constructive ties among the United States, Iran and the international community. This process will not be advanced by threats. We seek instead engagement that is honest and grounded in mutual respect.”

Iranian officials reacted to the tape by renewing calls for the US to address Iranian grievances, including the 1953 coup that overthrew Iran’s nationalist government.