Iranian riot police take their positions among protesters in central Tehran November 4, 2009. Tens of thousands of Iranians held demonstrations on Wednesday across the country to mark the 30th anniversary of the seizure of the U.S. embassy in Tehran by Iranian students. In Tehran, the demonstrators gathered outside the former U.S. embassy in central Tehran, carrying placards expressing their hatred of the "arrogant powers" and shouting anti-U.S. and anti- Israel slogans.

Iranian riot and plainclothes policemen detain a man during protests in central Tehran November 4, 2009.Tens of thousands of Iranians held demonstrations on Wednesday across the country to mark the 30th anniversary of the seizure of the U.S. embassy in Tehran by Iranian students. In Tehran, the demonstrators gathered outside the former U.S. embassy in central Tehran, carrying placards expressing their hatred of the "arrogant powers" and shouting anti-U.S. and anti- Israel slogans.

An Iranian walks past a mural of a former American hostage outside the former U.S. embassy in Tehran November 4, 2009.Tens of thousands of Iranians held demonstrations on Wednesday across the country to mark the 30th anniversary of the seizure of the U.S. embassy in Tehran by Iranian students. In Tehran, the demonstrators gathered outside the former U.S. embassy in central Tehran, carrying placards expressing their hatred of the "arrogant powers" and shouting anti-U.S. and anti- Israel slogans.

Iranian students hold a caricature of U.S. President Barack Obama during a rally outside the former U.S. embassy in Tehran November 4, 2009. Tens of thousands of Iranians held demonstrations on Wednesday across the country to mark the 30th anniversary of the seizure of the U.S. embassy in Tehran by Iranian students. In Tehran, the demonstrators gathered outside the former U.S. embassy in central Tehran, carrying placards expressing their hatred of the "arrogant powers" and shouting anti-U.S. and anti- Israel slogans.

Iranian students wave flags and pictures of Supereme Leader Ayatollah Ali Khamenei during a rally outside the former U.S. embassy in Tehran November 4, 2009. Tens of thousands of Iranians held demonstrations on Wednesday across the country to mark the 30th anniversary of the seizure of the U.S. embassy in Tehran by Iranian students. In Tehran, the demonstrators gathered outside the former U.S. embassy in central Tehran, carrying placards expressing their hatred of the "arrogant powers" and shouting anti-U.S. and anti- Israel slogans.

Iranian women attend a rally outside the former U.S. embassy in Tehran November 4, 2009.

Iranian students wearing Palestinian scarves and headbands reading "Khamenei Leader" attend a rally outside the former U.S. embassy in Tehran November 4, 2009. Tens of thousands of Iranians held demonstrations on Wednesday across the country to mark the 30th anniversary of the seizure of the U.S. embassy in Tehran by Iranian students. In Tehran, the demonstrators gathered outside the former U.S. embassy in central Tehran, carrying placards expressing their hatred of the "arrogant powers" and shouting anti-U.S. and anti- Israel slogans.

Iranian demonstrators carry a British flag during a rally outside the former U.S. embassy in Tehran November 4, 2009. Tens of thousands of Iranians held demonstrations on Wednesday across the country to mark the 30th anniversary of the seizure of the U.S. embassy in Tehran by Iranian students. In Tehran, the demonstrators gathered outside the former U.S. embassy in central Tehran, carrying placards expressing their hatred of the "arrogant powers" and shouting anti-U.S. and anti- Israel slogans.