Cambodian security guards and city workers, watched over by riot police, dismantled a camp occupied by anti-government demonstrators on Saturday, a day after a bloody crackdown on garment factory workers allied with the protest movement.
Friday's clashes, during which police shot dead four people, have stoked a political crisis in which striking workers and supporters of the opposition Cambodia National Rescue Party (CNRP) are challenging a government they say cheated its way to power and is depriving them of a fair wage.
Despite the crackdown, CNRP leader Sam Rainsy vowed that a mass march and rally planned for Sunday would go ahead. Rainsy also condemned the violence and demanded a thorough investigation.
Hundreds of CNRP supporters have been camped since Dec. 15 in tents around a stage in Freedom Park, the only place in Phnom Penh where protests are allowed.
Unions representing garment workers want better pay and support CNRP's demands for a re-run of an election in July it says was rigged to allow long-serving Prime Minister Hun Sen to remain in power.
Friday's clashes took place at Canadia Industrial Park, also in Phnom Penh, which is home to dozens of factories that make clothing for Western brands such as Adidas, Puma and H&M Hennes & Mauritz.
On Saturday, many CNRP supporters grabbed their belongings and fled, some clutching babies, when they saw riot police approaching Freedom Park, Reuters witnesses said.
Riot police however held back from the main site while security guards and city workers in plain clothes, some carrying axes and steel pipes, moved in to dismantle the stage and tents. Three helicopters flew low overhead, while riot police carrying batons kept journalists away from the site.
CNRP issued a statement accusing "forces in civilian clothing" of beating demonstrators and urged its supporters not to retaliate.
Phnom Penh municipality spokesman Long Dimanche said CNRP leaders had been sent a letter telling them protests would no longer be tolerated.
"Their protests have been peaceful at the park but their supporters have marched out of the park, destroying private and public property, closing down roads and causing social instability," he said.
Rainsy called for both sides to exercise restraint.
"We deplore and condemn the violence that the armed forces under the instruction of the current government has used against workers," Rainsy, a former finance minister, told a media briefing before the protest camp was cleared.
"So we have made an appeal to both sides, workers and armed forces to withdraw to stop using any form of violence so we can find a peaceful solution," Rainsy said.
Amnesty International joined Rainsy and Cambodian rights group LICADHO in demanding an investigation into the violence.
"The Cambodian government has to rein in its security forces," said Amnesty's Cambodia researcher Rupert Abbott.
Friday's violence followed a crackdown a day earlier outside a Yakjin (Cambodia) Inc factory in another part Phnom Penh, when armed troops hit protesters with batons, wounding 20 people. Yakjin makes clothing for Gap and Walmart.
The CNRP has won the support of some 350,000 garment workers from nearly 500 factories across Cambodia by promising to nearly double the monthly minimum wage to $160 if it wins a re-run of the July election, which Hun Sen is refusing to hold.
The government is refusing to raise the wage beyond $100 dollars a month and has ordered factories to reopen to prevent damage and job losses in an industry worth $5 billion a year.
Garment manufacturing is Cambodia's biggest foreign currency earner and a major employer. Many Western brands outsource footwear and apparel to Cambodian factories, in part because labour is cheaper than China.