Replying to the notice for the motion, sought to be moved by the the CPI(M)-led LDF, state Home Minister Ramesh Chennithala said Vigilance was yet to submit the probe report in court and the Opposition was seeking a debate on a matter based on media reports.
"The government cannot carry on the investigation based on rumours and media reports," he said.
Stating that the state government had never intervened at any time during the investigation, Chennithala said the probe was progressing in a free and fair manner.
The Kerala Home Minister also rejected Opposition allegation that the Vigilance chief altered the "factual report" prepared by the investigating officer and sought a new one.
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Seeking notice for the adjournment motion, S Sharma (CPI-M) alleged that government had interfered in the probe and the investigating officers were denied chances to submit a free and fair probe report.
He also said it would not be "sub-judice" to discuss the matter in the House as the charge sheet in the case was not filed in the court.