According to the NEC, some 80 percent of the 8 million eligible voters had cast a ballot.
The dam collapse follows heavy rains across Southeast Asia, which has led to severe flooding in several parts of Cambodia.
Human Rights Watch and the International Federation for Human Rights said in a statement that the election would pave the way for Hun Sen to cement his uncontested power in Cambodia.
Many Cambodians support the CPP due to its investment in numerous local development projects.
Congressman Ed Royce, chairman of the foreign affairs committee, said: “The people of Cambodia deserve far better than the Hun Sen’s despotism.”
ការធ្វើយុទ្ធនាការឃោសនាបោះឆ្នោតថ្ងៃចុងក្រោយរបស់គណបក្សនយោបាយបានចាប់ផ្តើមនៅក្នុងរាជធានីភ្នំពេញកាលពីព្រឹកថ្ងៃទី២៧ កក្កដា ឆ្នាំ ២០១៨ សម្រាប់ការបោះឆ្នោតជាតិអាណត្តិទី០៦ដែលនឹងប្រព្រឹត្តទៅនៅថ្ងៃទី២៩ ខែ កក្កដា ឆ្នាំ២០១៨ ខាងមុខក្នុងប្រទេសកម្ពុជា។ អ្នកគាំទ្រគណបក្សនយោបាយទាំងក្មេងទាំងចាស់រាប់ម៉ឺននាក់ត្រូវបានឃើញចូលរូមយុទ្ធនាការបោះឆ្នោតនេះយ៉ាងសកម្ម ដែលមានការហែក្បួននៅជុំវិញរាជធានីភ្នំពេញ។ ខាងក្រោមជាទិដ្ឋភាពខ្លះៗដែលក្រុមការងារ VOA ខ្មែរចាប់យកបាន។
The CPP has used many slogans during its campaign, including perhaps the most ubiquitous: “A CPP Win Means the Whole of Cambodia Wins”.
A VOA Khmer investigation in April found evidence of large-scale troop movements in late 2017 from the highly militarized provinces of Oddar Meanchey and Preah Vihear to Siem Reap province.
Under the election laws of Cambodia, preventing someone from voting can carry a fine of up to about $5,000.
VOA Khmer's Aun Chhengpor recently sat down with Suos Yara, a CPP lawmaker, and spokesman, to talk about the ruling party’s definition of electoral democracy.
Cambodians will vote on Sunday in an election that has been criticized as a one-horse race with Prime Minister Hun Sen expected to win.
The criticism came after Rhona Smith questioned the targeting of election boycott campaigners by the Cambodian authorities.
It's not clear to what extent such a ruling has a basis in Cambodian law.
The Interior Minister said Cambodians who were found to have taken part in the campaign would be fined up to 20 million riels (about $5,000).
The Center for Strategic and International Studies report found that the Cambodian courts were the main tool used by the authorities to clamp down on civil society groups the authorities saw as challenging.
The four tycoons identified by Global Witness are Mong Reththy, Ly Yong Phat, Try Pheap and Lao Meng Khin.
The leaders pointed to the One Belt, One Road initiative, a Chinese initiative that will connect the economies of Southeast Asia with large infrastructure projects.
Hang Puthea, NEC spokesman, said the messages were intended to remind political parties that they must comply with the law, adding that some political parties had already received fines for violations.
In a statement on Wednesday the ministry ordered commune and district officials to issue documents to voters whose identity cards may have been lost or damaged.
ព័ត៌មានផ្សេងទៀត