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HONG KONG — Military police officers fired Friday on protesters demanding higher wages for Cambodian garment workers, killing at least three people, officials said, as antigovernment protests against the decades-old rule of Prime Minister Hun Sen entered a volatile new phase.

The garment workers are demanding a doubling of their monthly wages, and they have been at the forefront of growing protests against Mr. Hun Sen's authoritarian government. On Sunday, tens of thousands of people rallied to demand that Mr. Hun Sen step down.

But Friday's violence south of Phnom Penh, the capital, marked a sharp escalation in the unrest. Protesters resisted police efforts to break up the demonstrations, and some threw homemade explosives, setting fire to vehicles, and pelted officers with rocks and other projectiles. As the street battles raged, the police fired live ammunition to try to quell the disturbances.

Another large opposition rally that is planned for Sunday, one that aims again to turn out tens of thousands of people to force an end to Mr. Hun Sen's rule. In July, Mr. Hun Sen's party claimed victory in disputed elections that the opposition and many independent monitoring organizations said were deeply flawed.

The week of protests represents the biggest threat yet to the rule of Mr. Hun Sen, whose party tightly controls the police, the military, the judiciary and much of the news media.

Chuon Narin, deputy chief of the Phnom Penh Municipal Police, told The Associated Press that the three people who were killed in Friday's violence died when police officers in a southern suburb of the capital fired AK-47 rifles to clear a road that had been blocked by protesters who were burning tires and throwing objects.

"So far, three are confirmed dead, two injured and two men were arrested by armed forces," the deputy police chief said after the morning clash.

Because of the violence, the opposition Cambodia National Rescue Party withdrew on Friday from planned talks with the government that were aimed at trying to resolve the crisis. In pulling out of the talks, the group cited the violence against both the garment workers and monks taking part in the protests.

"We condemn the act of violence against the monks, against the workers who are demanding the minimum wage of $160," Yim Sovann, an incoming C.N.R.P. lawmaker, told the Phnom Penh Post. The garment workers currently receive a monthly wage of $80.