Senior officers of the CBI’s Anti Corruption Branch remained busy throughout Tuesday, readying their points and getting them vetted by bosses in Delhi to justify the demand of shifting the Narada probe out of Bengal on grounds of deteriorating law and order in Bengal, a narrative that senior BJP leaders of the state have been trying to build upon for sometime.

On Monday, the CBI had moved Calcutta High Court with an appeal of shifting the probe out of its jurisdiction under Section 407 of the CrPC. The central investigating agency had suggested in the appeal that it intended to transfer the Narada case outside Bengal for fair interrogation.

Early on Tuesday, senior officers drew up a report outlining how things had unfolded outside the Nizam Palace in Calcutta following the arrest of four accused persons in the Narada sting case on Monday morning. Sources in the central agency claimed that the report outlined how a mob had attacked paramilitary force personnel, who had been brought in to throw a ring of protection outside the CBI office, with stones, glass bottles and other flying objects.

The report which was sent to the ministry of home affairs headed by Amit Shah purportedly described how the mob kept growing with passing hours outside Nizam Palace.

CBI officers in the know said the report also mentioned that chief minister Mamata Banerjee had turned up at the office and spent over six hours on Monday following the arrests of the quartet.

“The report was sent to the MHA to apprise the bosses of how things had played out throughout Monday following the arrest. This is a protocol that one has to follow,” said a senior CBI officer.

What remained unsaid was the report was a part of a string of initiatives by the CBI to build its case of justifying how it was feeling intimidated by the state of affairs.

“The CBI is being subject to mobocracy here. So, how will an investigating agency operate?” asked Jay Prakash Majumdar, BJP’s vice president in Bengal. “The chief minister of a state is claiming that she will stand between the accused and the investigating agency. So, how will the agency function in the state?”

While pleading its case on Wednesday, the CBI would underline how it had taken up the investigation of the Narada case following orders of the high court in April 2017, officers said, adding that the agency would also state how it was now struggling to abide by the directions of the court in completing the task.

“If the law minister of a state is present in the lower court around the time when other leaders are making statements that would incite the mob in Calcutta and elsewhere, how is it possible to carry on with the investigation?” asked an officer.

Between the exchange of mails and faxes with the legal counterparts in Delhi and drawing up reports for Wednesday, the CBI also informed Assembly Speaker Biman Banerjee about the arrests of three MLAs outlining the details of the case and the charges.