LDF members led by their leader and CPI-M veteran V S Achuthanandan staged a walkout when an adjournment motion, sought to moved by them, was rejected by Speaker N Sakthan.
As soon as the zero hour began after an obituary reference to a former MLA who died recently, CPI-M Deputy leader Kodiyeri Balakrishnan sought leave for the motion and alleged that government was trying to sabotage vigilance probe in the case.
"Report will be filed in the court as and when the probe is over following all legal and procedures," he said.
"Vigilance is conducting the investigation impartially and government has not interfered in the probe," he asserted.
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Countering the opposition charge that vigilance was trying to give a clean chit to Mani, he said investigating agency could take action only on the basis of evidence "and it cannot take steps just to satisfy the opposition."
The preliminary investigation against Babu was also in the final stages, he said.
Slamming the opposition for attacking the government based on the charges of bar hotel owners, Babu said it was part of a conspiracy to pull down the UDF government.
LDF members came to the House with placards and banners demanding resignation of Mani and Babu.
The UDF government has been under attack ever since Biju Ramesh, working president of Kerala Bar Hotel Owners Association alleged in November last that Mani had accepted a Rs one crore bribe from the association. Later he also alleged that the association also paid bribe of Rs ten crore to Babu.
The House had witnessed unprecedented bedlam on March 13 with LDF demanding Mani's resignation over the bar bribery licence scam when he presented the budget.