The memorial, a black marble plaque with gold lettering, was mounted on the wall at Anlong Veng High School.
The arrest came just days after a state visit from US Secretary of State Hillary Clinton.
Police say Beehive Radio operator Mam Sonando has been leading a secessionist movement, inciting people against the Cambodian government.
Commerce official Francisco Sánchez traveled to Cambodia last week to strengthen trade relations between the United States and Southeast Asia.
Cambodian police have arrested the owner of one of Cambodia’s last independent radio stations on charges relating to sedition.
Asean members on Friday could not agree on a final joint statement at the end of eight days of meetings
Meanwhile, China has built strong relationships across the region, in countries like Cambodia, which could divide Asean countries.
US Secretary of State Hillary Clinton delivered an address ahead of her meeting, saying she “strongly” supports Asean.
Mam Sonando says he will defy a government threat of prosecution and return to Cambodia from abroad this week.
Patrick Devillers, who has been detained since his arrest in Phnom Penh on June 13, can return at his own request.
Asean leaders are expected to approve the declaration in a major summit in November.
The God particle is just a fancy name for a sub-atomic particle called the Higgs Boson.
Fever, poor appetite, malaise and sore throat are all symptoms of the disease.
A code of conduct would help Vietnam and the Philippines, which are both members of Asean.
Analyst Lao Monghay told “Hello VOA” Thursday the Phnom Penh court’s decision had little basis in law.
US Secretary of State Hillary Clinton’s trip to the Asean Regional Forum in Phnom Penh next week will mark her second visit to Cambodia.
The Sam Rainsy and Human Rights parties have discussed the possibility of merging together, but so far remained separate entities.
About 100 US investors are expected to travel with Clinton when she comes to Cambodia next week for an Asean forum in Phnom Penh.
Tribunal spokesman Lars Olsen told the gathering that there would be no more new cases beyond those already before the court.
Interpol equipment linked to the database has been installed in Cambodia since June, officials said.
ព័ត៌មានផ្សេងទៀត