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A protester supporting the opposition Cambodia National Rescue Party (CNRP) throws a stone as another tries to remove barbed wire barricades during clashes with police near the Royal Palace in central Phnom Penh

A protester supporting the opposition Cambodia National Rescue Party (CNRP) throws a stone as another tries to remove barbed wire barricades during clashes with police officers near the Royal Palace in central Phnom Penh September 15, 2013. Thousands of demonstrators defied road blocks and a jail threat to hold a march in Cambodia's capital on Sunday in a last-gasp push for an independent probe into a July election they say was fixed to favour the ruling party. REUTERS/Samrang Pring (CAMBODIA - Tags: CIVIL UNREST POLITICS CRIME LAW TPX IMAGES OF THE DAY)

Cambodia elections protests

Riot police fired smoke grenades and water cannons at rock-throwing protesters Sunday Sept. 15,2013 as a new wave of demonstrations against Prime Minister Hun Sen’s government kicked off with a vow to protest until the nation’s post-election deadlock is resolved. (Associated Press)