The Cambodian Appeals Court is expected to release jailed Beehive Radio owner Mam Sonando on Friday.
Witnesses and rights activists said six people were seriously injured after they were beaten by riot police armed with shields and electric batons.
More than 300 protesters from the Boeung Kak and Borei Keila forced evictions gathered on Friday, holding a demonstration to mark International Women's Day.
Overseas supporters of the Cambodia National Rescue Party are organizing to push for the opposition's success in the July parliamentary polls in Cambodia. A major fundraiser will be held March 23 by the US-based National Rescue Foundation, with other supporters overseas to follow suit. VOA Khmer's Men Kimseng recently spoke with activist Touch Vibol to discuss the aims of the foundation and the concept of political fundraising, which is not well known in Cambodia.
Mam Sonando told VOA Khmer outside the court that he was happy to see two charges dropped and that he expects to be released eventually.
The Cambodian Court of Appeals on Monday began a hearing in the case of jailed Beehive Radio owner Mam Sonando, as hundreds of supporters gathered outside the court demanding his release. Mam Sonando is serving a 20-year prison sentence on charges he helped foment a secessionist movement in Kratie province, charges that rights workers say have little evidence and were leveled at him after his public criticism of Prime Minister Hun Sen. VOA Khmer's Heng Reaksmey reports from Phnom Penh.
Mam Sonando appeared thinner as he entered the court Tuesday, waving victory signs with his fingers.