The DSI has sent its findings and evidence to the National Anti-Corruption Commission so it can launch legal action the firms, as the DSI does not have the authority to do so, Tarit said.
He said the DSI reported the results of its probe to Interior Ministry permanent secretary Pranai Suwannarat, who will decide whether to set up a disciplinary inquiry committee to conduct its own investigation into the actions of the 10 middle- and low-ranking officials.
A DPMD deputy director-general who was also investigated was found not to have committed any offence. The DSI did not include him in the list of officials found to have violated Article 157 of the criminal code by performing their duties dishonestly.
“The DSI will continue investigating the two private companies’ involvement in this case to see whether they colluded on bids,” he said.