The three had criticized Laos online and were detained after returning from Thailand to renew their passports.
Thai and Cambodian groups say that prior notification and consultation procedures for the Pak Lay hydropower project are not transparent.
The groups call for an on-site investigation of the dam collapse to produce credible measurements of the damage it has caused.
State officials will investigate a 'lack of transparency' in the awarding of contracts to build facilities, sources say.
“They just wanted to talk with me about some issues,” she later wrote.
Phijika Boonkwang had resigned on Facebook after being accused of defaming the country over the condition of a local road.
Reports are still coming in from remote areas hit by heavy rains, officials say.
Hundreds may not open in time for the start of the school year on Sept. 3, Lao sources say.
Monsoon rains continue to inundate the northern and central parts of the country.
Phijika Boonkwang, the country's first female team president, had criticized the condition of a road leading to a playing field.
Save the Mekong says it does not believe that a review of the Pak Lay dam can be conducted in a meaningful or effective way.
A retired health official says the company that invested in the hydropower project should be held accountable.
Relief work is hampered by poor roads and shortages of manpower and farm goods following more flooding.
Builders of the proposed Pak Lay and Pak Beng dams say they are continuing their surveys and feasibility studies.
CCTV footage appears to show Xaysana Yotsavath’s killers, but authorities have yet to identify them.
They call on the Lao government to compensate villagers affected by the deadly collapse of a saddle dam at the Xe Pian Xe Namnoy hydropower project.
Meanwhile, others who relocated two years ago say they have yet to receive promised vocational training.