Demonstrators began chanting 'God is Great' and 'Death to the dictator', slogans which protesters have been using since the election, as hundreds of police drove the protesters apart in the Behesht-e Zahra cemetery in southern Tehran, witnesses said.

Official figures have put the number killed in recent demonstrations at 20, although an MP later stated that the number was 30.

Authorities last week rejected a request by Moussavi and another opposition leader, Mehdi Karrubi, to hold an official mourning ceremony in Tehran's Mosalla Square.