According to sources, Sarabjot allegedly demanded a bribe of Rs. 1 crore from a Nashik-based contractor to close a case before the Commission.

Sarabjot had earlier claimed innocence, saying it was a conspiracy against him and that he was being framed.

Sarabjot was arrested by the Anti Corruption Branch of the CBI on Thursday evening in New Delhi [ Images ] and was taken to investigating agency''s Mumbai [ Images ] office.

In the wake of his arrest, the opposition is calling for Buta Singh''s resignation from the Commission.

Senior Bharatiya Janata Party [ Images ] leader Gopinath Munde [ Images ] said, "Buta Singh must resign immediately."

According to sources, a corruption case was filed on the basis of complaint by Ramraj Patil, a Nashik-based civic works contractor.

In his complaint, Patil had alleged that Sarabjot had demanded a bribe of Rs 3 crore, which was later brought down to Rs.1 crore, for withdrawal of a case under the Scheduled Castes/Scheduled Tribes (Prevention of Atrocities) Act, filed against Patil by a group of local conservancy workers employed by him.