The National Council for Peace and Order (NCPO) Sunday denied claims by red shirt activist Kritsuda Khunasen that she had been tortured during military detention.
Ms Kritsuda now says this video shown on army TV in late June was staged and fake. Rather than being united with her boy friend, she was forcibly separated from him and forced to sign a paper saying she was treated well.
NCPO spokesman Col Winthai Suvaree questioned the motive and the timing of Ms Kritsuda's claims, pointing out they were made as the criminal cases against her were developing well.
Ms Kritsuda was arrested in Chon Buri on May 28 for refusing to report to the NCPO after it summoned her on suspicion of involvement in computer crime and weapons-related charges. No one heard of her after her arrest and rumours spread that she died in detention.
The military released a video clip which it aired on free TV to show she was safe and sound. The next day she was released and told the press she was treated well throughout her detention.
However, the red shirt has now reappeared in a half-hour clip on Youtube in which she told anchorman Chom Phetpradap that the NCPO tortured and assaulted her. Chom told viewers Ms Kritsuda had left Thailand and was seeking political asylum in Europe, before proceeding with the interview via Skype.
In the clip, Ms Kritsuda said she was maltreated by NCPO officials during her 27-day detention. The military questioned her in a threatening manner about the red shirt movement and tried to make her implicate deposed prime minister Thaksin Shinawatra in firearms offences.
She said she was "physically tortured and assaulted" when they were not happy with her statements. The torture tactics included covering her head with a plastic bag and having female soldiers give her a bath while she was being blindfolded.
Ms Kritsuda said the clip which she made for the military was staged. After seven days of detention she was forced to sign a letter asking if she could stay in the military barracks for safety reasons. Under martial law, individuals can be detained up to seven days.
Col Winthai said Ms Kritsuda might be trying to draw attention away from certain organisations in her attempts to discredit the military. She might be concerned about her safety as several cases were progressing and a number of people would be affected. He insisted the army treats all detainees well.
Pol Gen Somyot Phumpanmuang, deputy national police chief, said he had asked authorities to investigate if the latest clip broke any laws.