Tarique Parveen, an alleged aide of fugitive gangster Dawood Ibrahim, was arrested by Thane police on Friday in an extortion case where IPS officer Param Bir Singh is one of the accused.

Tarique Abdul Karim Merchanta alias Tarique Parveen (55), who was already in jail in another case, was wanted in the case registered with the Thane Nagar police station here, an official said. The present FIR names over 20 persons including Singh, who had been police commissioner of Mumbai and Thane, and some other police officers.