Ever since November 4, 1979, Iran has effectively been in a state of war against the U.S. "Iranians burn US flags to mark embassy seizure," from AFP, November 2 (thanks to Anne Crockett):
Thousands of Iranians chanting "Death to America" burnt US flags on Friday to mark the 33rd anniversary of the seizure of the US embassy in Tehran, just days before the American presidential election.
The demonstrators also chanted anti-British and anti-Israeli slogans, and burnt Israeli flags, as they gathered in front of the site of the former embassy, dubbed the "den of spies" by the authorities who sponsor the annual commemoration, an AFP photographer reported....
The anniversary of the November 4, 1979 embassy seizure, which saw Islamist students hold 52 US diplomats hostage for 444 days, is commemorated in Iran according to the Persian calendar and this year fell on November 2.
The hostage-taking, which came just months after the Islamic revolution overthrew the US-backed shah, was seen as a big factor in then US president Jimmy Carter's loss of the 1980 election.
Now painted with anti-US murals, the former embassy site is currently a training and educational facility controlled by Iran's elite Revolutionary Guards.