Thane: Offences have been registered against four policemen in Bhiwandi town for allegedly detaining three persons on false charges and extorting Rs three lakhs from them to let them off, police said on Tuesday.

The policemen, attached with Narpoli police station, had detained Istiaque Makbul Ahmed Chowdhari, a local builder, his son Abdul Mabud alias Sonu and their neighbour Mefuz Alam on May 7 for their alleged involvement in theft of yarn from a container, senior inspector Anil Akhade said.