The CBI’s refusal to probe the 2012 abduction of a girl has shattered her parents, now on a fast-unto-death outside Town police station since Thursday.

Navruna Chakravarty (13) was abducted in September 2012 from Jawaharlal Road under the jurisdiction of Town police station.

Her mother, Maitri, told The Telegraph they received a letter from the CBI on December 25 last year, expressing the agency’s helplessness to investigate the case. The CBI squarely blamed the state government for not deputing police officers to help it investigate the cases referred to it, the mother said.

Maitri, in a choked voice, said she and her husband Atul Chakravarty had met chief minister Nitish Kumar in September last year urging for a CBI probe to trace her abducted daughter.

On the chief minister’s intervention, the government requested the CBI to probe the case. But the CBI turned down the government’s request and the top police brass is keeping mum, she said.

Earlier in March last year, the crime investigation department of state police had probed the case. The investigation continued for nine months but nothing came of it, Maitri said. The mother alleged that then CID inspector-general Arvind Pandey had complicated the case by sitting on it and doing precious little in the nine months the department was probing it.

She alleged that property dealers, politicians and police officers were hand in glove with the criminals who hatched the plan to abduct her daughter and this was the reason why her daughter had still not been found.

The parents even suspect foul play in the state government not making a fresh request for CBI probe. They have appealed to the chief minister to once again request the CBI to probe the case or their crusade would go on.

When the CID was probing the matter, Navruna’s parents had refused to provide blood samples for matching DNA with the corpse of a girl of the same age. They had said they would give blood samples to only the CBI.