Moscow rally calls on Putin to go

Russia's opposition leaders, former ministers and celebrities have joined tens of thousands of people demonstrating in sub-zero temperatures in Moscow and other Russian cities.

The crowds jeered the Kremlin in a show of anger at alleged electoral fraud in this month's parliamentary elections.

Prime Minister Vladimir Putin's United Russia Party won the vote despite a sharp drop in support.

The government denies that the elections were rigged.

Daniel Sandford reports from Moscow.