At least 500 people marched through Dublin city centre this afternoon in an anti-war demonstation to mark the third anniversary of the beginning of the conflict in Iraq.

The Irish Anti-War movement is calling on the government to ban US military planes passing through Shannon Airport.

The march through the city centre finished with a rally at the GPO on O'Connell Street.

Meanwhile, the Iraqi government has said that six people have been arrested in connection with the murder of a journalist and her crew from the Saudi-owned television network, al-Arabiya.

The journalist, Atwar Bahjat, her cameraman and her soundman were seized by gunmen and shot dead near Samarra last month.

Iraq's Defence Minister said the six were arrested during a joint US/Iraqi operation near Samarra.