Mousavi supporters march in Tehran

Nov 4 - Video footage posted on the internet appears to show supporters of Iran's opposition leader Mirhossein Mousavi marching in a rally in the country's capital Tehran.

EDITORS' NOTE: Reuters coverage is subject to an Iranian ban on foreign media leaving the office to report, film or take pictures in Tehran

Witnesses said that police had clashed with hundreds of protesters who were chanting 'Death to dictators'.

Reformist website, Mowjcamp, said police opened fire on supporters of opposition leader Mirhossein Mousavi at Haft-e Tir square.

The clashes came during a rally marking the 30th anniversary of the storming of the U.S. embassy.

Iran's Revolutionary Guards and its allied Basij militia have warned the opposition to avoid using any anti-U.S. rally to revive protests against the clerical establishment after June's disputed presidential election in which Mahmoud Ahmadinejad won a second term.