section_path: Investigation
section_name: Investigation
paragraph_text: Investigation
  
  On 28 March 2025, Paetongtarn ordered the formation of a committee of experts to investigate the collapse within a week. On 2 April, she visited the site again and met with relatives of the collapse victims. Investigators focused on whether "the construction quality, materials used, and whether building codes for earthquake resilience were adequately followed." On 30 March, Industry Minister Akanat Promphan said at an on-site news conference that "anomalies" had been found in the steel and samples taken.
  
  In China, online discussion on the collapse of the building was censored in the same way as commentary on other Tofu-dreg projects.
  
  Thailand's Ministry of Industry later said that one of the steel bars used in the collapsed building was substandard and came from a Chinese company, Xin Ke Yuan Steel, in Thailand. The company providing it had been ordered to close since December 2024.
  
  On 19 April 2025, Police Colonel Tawee Sodsong announced that a Chinese national who was a representative of China Railway No. 10 was arrested while three Thai company shareholders were issued with arrest warrants over the collapse. On 15 May, arrest warrants were issued for 17 individuals over the collapse, including former Italian-Thai Development president Premchai Karnasuta, who surrendered along with 14 other suspects in Bangkok. He denied the charges.