More than 700 people gathered Saturday to protest the Iranian president's denial of the Nazi Holocaust as Iran played its second match at the World Cup. Demonstrators waved Israeli flags at the rally outside the Alt Oper opera house in Germany's financial capital. Some held up signs reading "Support Israel Now!" and "Israel has the right to exist." They were joined by a small group of Iranian dissidents with their country's flags. Police said there were no incidents at the rally. President Mahmoud Ahmadinejad has caused international outrage by dismissing the Holocaust as a myth and questioning Israel's right to exist.