Iran is marking the 36th anniversary of its 1979 Islamic Revolution as the country continues negotiations with world powers over its contested nuclear program.

State television aired footage of commemorations in Tehran and elsewhere across the country Wednesday. Some participants chanted "Down with the U.S." and "Death to Israel."

On Feb. 11, 1979, followers of Ayatollah Ruhollah Khomeini ousted U.S.-backed Shah Reza Pahlavi. America helped orchestrate the 1953 coup that overthrew Iran's popularly elected prime minister, Mohammad Mossadegh, which brought Pahlavi to power and set the stage for decades of mistrust between the countries.

In recent years, Iran has used the anniversary of the Islamic Revolution to demonstrate against the West over its sanctions for the country's disputed nuclear program. Diplomats are negotiating a final deal over the program now.