Four workers die in Bangkok sewer

Bang Na police were alerted at 10.45am that five workers were in danger in the wastewater-treatment pipe system at CPF Co in Soi 20 on Bang Na-Trat Road. 
Four of the workers died despite efforts to resuscitate them, while the fifth was rushed to hospital.
As of press time on Friday, police were inspecting the scene to try and determine the cause of the tragedy.