A building collapsed at the Bang Phli electricity authority training centre in Samut Prakan on Monday, injuring four construction workers.
The building, on Soi Kan Kheha Haeng Chat Bang Phli, collapsed about 11.45am, Fire and Rescue Thailand reported.
The building was under construction when the roof fell in.
Emergency responders were dispatched to the scene.
It was later confirmed that four contract workers were injured and were receiving treatment at a hospital.
Electrical authority and other officials inspected the collapse site to assess the situation.
Public access had been restricted and stricter enforcement of safety standards ordered at the construction site. The cause of the collapse was under investigation.
