Forensic Evidence
Police General Ajiravid Subarnbhesaj claimed that all eight bombs were placed in 3x5-inch boxes and detonated by digital alarm clock. Traces of M4 high explosive booster were found in all of the bombs. Other military ordnance sources claimed the bombs were all ammonium nitrate fuel oil (ANFO)/M4 bombs. This would make the bombs the same type as found in a car outside of Thaksin Shinawatra residence in August 2006.
The police were criticized for barring Central Institute of Forensic Science acting director Pornthip Rojanasunand from collecting evidence from a bombing site in Pratunam. She called the police unprofessional because they mainly focused on the type of bomb that was used, rather than the identity of the bombers, and let city cleaners clean the site before collection of evidence was completed.
Premier Surayud ruled out involvement of Southern insurgents. He noted that forensic reports showed that the bombs were assembled to look like those used by the Southern insurgents but that detailed examination of the explosions and modus operandi indicated no link.
Read more about this topic: 2006 Bangkok Bombings
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