Cambodian Center for Human Rights' (CCHR) acting director Pa Nguon Teang has been arrested by the border authorities along with CCHR spokesman Ou Vireak and Mr. Pa's friend at the Cambodia Laos border.
Mr. Pa told VOA stringer by telephone at the site that the three of them want to go to the border with Laos for a sightseeing.
Police authorities told VOA stringer that police chief, General Hok Lundi gives order for the arrest.
Mr. Hok Lundi cannot be reached for comment. Ministry of Interior spokesman Khieu Sopheak says that the arrest was made by court order.
If Mr. Pa has something to do with the banner displayed at the CCHR booth defaming the government, he will be detained.
US Embassy spokesman Jeff Daigle says that the Embassy asks the government to reconsider freedom of speech and democracy issue.