The attempt to lynch Rupam Pathak just after she stabbed the Bharatiya Janata Party MLA from Purnia Sadar, Raj Kishore Kesri, on Tuesday morning has made the investigators suspicious.
The police rejected BJP leaders' allegation that Pathak had tried to blackmail Kesri.
"There is no evidence of blackmailing," said a senior police official on condition of anonymity.
In fact, he said, "That Rupam Pathak took this extreme step shows that everything is not as clean as is being made out to be by the BJP."
Earlier, Pathak (40), who ran a school, accused Kesri and his close aide Bipin Rai of repeated sexual exploitation. But later, she retracted her allegation.
But the police said Pathak maintained her first allegation of having been sexually exploited in her preliminary statement.
"We will cross examine her, particularly as she had retracted her allegation of rape before a magistrate," said the police official.
Incidentally, even after retracting her statement, Rupam filed a case in the court, alleging that she had been pressured to withdraw the rape charge. The hearing was scheduled for March 25 this year.
There is, however, hardly any taker for the police version that she had taken back the rape charge last year and that her husband and other family members did not pursue the charge.
They did pursue it. Locals said Pathak claimed on a local TV channel that the police station she went to refused to record her case and there was no help from anywhere.
"It's premature to arrive at any conclusion. There is no scientific evidence of rape as the case was lodged long after the claimed incident," said deputy inspector general of the Purnia range Amit Kumar.
Another theory that is doing the rounds is that Pathak was used as a pawn to get Kesri -who won assembly four successive assembly polls - out of the way.
"We have already demanded a CBI probe," said Rajendra Gupta, BJP member of the legislative council.