Barely a week after the arrest of Rajani Pandit, famed as India's first private woman detective, the Thane Crime Branch is now investigating the role of some policemen suspected to be involved in a blackmail or extortion racket along with her, a top official said in Thane.

"We are probing this matter from all possible angles. We are trying to ascertain the role of even some policemen in the case," Police Commissioner Parambir Singh said here.