The National Election Committee (NEC) said the CPP had secured 1,156 seats out of a possible 1,646 and more than 3.5 million votes.
Final results confirm dominance of Prime Minister Hun Sen's ruling party, but strong showing by opposition saw its prospects boosted for next year's general election.
The result will be announced at 9am and again at 7pm, according to the NEC’s website.
Pich Sros did not explain which law he is alleging Kem Sokha broke in what is often considered a normal part of campaigning in a democracy.
The official results of the election will be announced by the National Election Committee towards the end of the month.
Sebastian Strangio, a former reporter at the Phnom Penh Post, said the CPP felt threatened by increasing support for the opposition.
Hun Sen, Cambodia's longtime ruler, warned opposition parties not to challenge the result of June 4th local elections or they could be dissolved.
Some 2,000 workers went on strike at the factory following the commune elections on June 4.
Speaking to officials in Kandal province, Sokha, whose party took seats in Sunday’s election from the ruling Cambodian People’s Party in several provinces, thanked voters for choosing to support the CNRP.
The Southland factory suspended 10 members of the Collective Union of Movement of Workers (CUMW) after they protested the decision, according to an industry association.
Hang Puthea, NEC spokesman, on Tuesday apologized for the delay in an interview with VOA on Tuesday.
Election observers have opted to wait until the official results are announced before commenting on the quality of the election process.
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