A complaint of extortion was filed against IPS officer and former Mumbai police commissioner Param Bir Singh here on Thursday, police sources said.

The process of registering a First Information Report (FIR) was underway at the Thane Nagar police station, said an official. The complaint, filed by alleged cricket bookie Sonu Jalan and businessman Ketan Tanna, also names former “encounter specialist” police officer Pradeep Sharma, he said, without giving more details.