Today's rally in the Iranian capital puts more pressure on moderate President Hassan Rouhani, just a week ahead of a meeting between American and Iranian officials over Tehran's controversial nuclear program.
The rally was organised by hard-liners and the demonstrators also chanted "Death to Israel" and "Death to Britain."
In 1979, militant Iranian students who claimed the US Embassy was a centre of plots against the Persian nation held 52 Americans hostage for 444 days. Ties between the two countries were severed after the siege and formal relations have not been restored since.