Home Minister K J George, without making any reference to the BJP demand, said the incident was being probed and government would take stringent action against the guilty.
George said the government has taken all possible steps to bring the accused and absconding persons to book.
Rejecting BJP members allegations that the government was protecting the accused and diluting the case, he said, "There is no truth in it and we are sincerely pursuing it and the guilty will be punished."
Raising the voice against government's "inaction" and the establishment's alleged attempt to protect the accused having political connection, all BJP members staged a walkout.
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BJP, which had also raised the issue yesterday, had alleged that the inspector had deliberately made the case weak by not invoking stringent sections under the IPC.
Both were taken to a nearby railway track where three men forced the woman's friend out of the car, while the fourth allegedly sexually assaulted her in the vehicle, police said.