If executives of CPF, a listed company, are found guilty they could face up to one year in prison and a fine of up to Bt400,000. 
Sumet Mahosot, director-general of the Department of Labour Protection and Welfare, said the department filed the criminal case on July 19 over the five deaths last month. 
A Chulalongkorn University student fell into sewage at the plant and four CPF employees tried to rescue her. All the deaths were due to toxic air and a lack of oxygen. The executives were accused of not informing its employees about the dangers of the site where the incident took place.&nbsp; 
Warning signs were not erected at the site, where limited air flows, and barriers were not put up to stop people entering the restricted area.

Labour Ministry files criminal case over Charoen Pokphand deaths

The Labour Ministry has filed a criminal case with police against Charoen Pokphand Foods over five deaths at the company’s wastewater treatment plant.