Police show a video recording of what they described as a confession by Army Lt Thawatchai Klinchana at a press conference yesterday.

In a pre-recorded statement released yesterday by police, the lone suspect in the car-bomb case said yesterday he would take sole responsibility for what he did and vowed to not implicate anyone behind the scheme.

In a 13.09-minute VCD recorded of a police questioning session, Army Lieutenant Thawatchai Klinchana also cited "a game of power play" that led to what police described as an assassination attempt against the caretaker prime minister.

He also apologised to the public and Thaksin Shinawatra for what happened.

"I am sorry for [driving the car around] knowing that the car is loaded with explosives. The Siam Thewathirat Guardian Angel proves to exist [to me], making the bomb fail.

"If the bomb went off a lot of people would suffer and I would be sinned forever. Why do we Thais do this [to each other]? All this started from a game of power play.

"I want all sides to turn to each other and talk in order to end all conflicts. I want to apologise to the public and the prime minister for what happened.

"I make all statements at my own will. No one made me do it. I will take responsibility for driving the bomb-laden car. Will I implicate other people? I wouldn't. I am a soldier and a man of my word. I and I alone take the blame."

Crime Suppression Division chief Police Maj-General Winai Thongsong, who released the statement, said Thawatchai told him that he had driven the "bomb-laden" sedan three days in a row until the vehicle was intercepted by police last Thursday.

Winai said security officers at the Air Force terminal at Don Muang spotted the suspect driving the Daewoo on August 9 and 10, when the prime minister's motorcade visited there.

Police spokesman General Ajiravid Subarnbhesaj, who also watched the VCD, said ownership of the Daewoo had been transferred four times, and that all other people involved in the ownership would be identified within the next 10 days.

Winai said police were able to get Thawatchai to talk through morality conditioning ploys. These were recommended by human behavioural experts who noticed that the suspect said his prayers before bedtime every night during his four days in police custody.

The video started with Thawatchai having his handcuffs unlocked while he sat at a desk in a room in the CSD compound with many senior police and two military officers from the Judge Advocate Corps present. Winai was heard asking Thawatchai how his life was and making an offer to give him what he needs.

Thawatchai asked for a battery-powered mosquito bat. Winai said he could not comply with the request but promised to get police to spray Thawatchai's cell with pesticide instead.

Earlier, the suspect's lawyer released an open letter to the national police chief complaining about an unexplained increase in the items of evidence in various investigation reports.

Reading out the letter, Sirichai Phakdee said police indicated there were three items found in the Daewoo sedan driven by Thawatchai, shortly after the vehicle was intercepted.

In statements issued later by police, the lawyer said seven items were reported as found in the vehicle, without explanation as to why the number had increased.

"The inaccuracy concerning strategic information in official documents has confused the public over how police are handling the case, as well as panicking them about the explosives' actual radius of impact," he said.

Bangkok police chief Pol Lt General Wiroj Jantharangsee and the first police statement asking that the suspect be kept in custody - submitted to the Bangkok military court last Thursday - said there were only three items found in the car driven by the suspect.

But all police statements later said a total of seven items had been found.

CSD chief Winai said police were confident they had produced concrete evidence against the suspect. But he did not know whether there were civilians also involved in what police described as an assassination attempt against the caretaker prime minister.

More than 20 witnesses have been questioned and it would be decided soon, depending on evidence to be further compiled, whether more suspects would be arrested.

The office dismissed Thawatchai's reference to a man identified merely as Jui as an accomplice. "The person might not even exist," he added.

The Bangkok military court turned down a request late yesterday evening for temporary release of Thawatchai on bail of Bt3 million, submitted by his lawyer and wife Sangworn.