Those arrested were Khat Sovann, 54, Pum Vannak, 53, Pon Soeurn, 34, and an unnamed fourth suspect.
Rights workers estimated between 400 and 1,000 villagers in Broma village, Chlong district, were set to be evicted.
At least 10 parties have registered for elections, which will be held across 1,633 communes next month.
Family members say Chan Samnang died because of exposure to poor living conditions at a relocation site outside the city.
An attorney for the three women, called the summons “a good opportunity” that would allow the women to “tell the true story."
Villagers say they have been pushed off nearly 1,500 hectares of land to make way for the senator’s sugar cane crops.
The country had nearly 450,000 Internet users at the end of 2011, according to the Internet World Stats website.
The study interviewed 1,522 people in Phnom Penh and the provinces of Kampong Speu, Prey Veng and Takeo.
Joel Brinkley, a professor of journalism, spoke to VOA Khmer recently about his book and possible solutions to Cambodia’s “curse.”
An estimated 2.3 million hectares were given over as concessions to private companies in recent years, Adhoc recently reported.
A United Nations-appointed rights watchdog is calling on Cambodia to bridge the widening gap between the rich and the poor.
Cambodia held its annual Plow Ceremony on Wednesday, with royal oxen predicting a good year for beans and corn.
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