Police have taken over 100 people into custody in a crackdown on fake and unauthorised medical clinics in Old City area. The drive was launched following recent death of one Khaja Naeemuddin while undergoing treatment of an alleged quack, identified as Ismail Hussain, and a woman, under Hussaini Alam police station limits, suffering paralysis after obtaining medication from another quack. The South Zone Police conducted the cordon and search operations last night as part of the 'Public Safety and Crime Prevention' and took into custody 107 persons. The operation was conducted on private medical practitioners and registered medical practitioners (RMPS) pretending to be doctors and on practitioners of Ayurvedic, Unani, Sadhak and prescribing Allopathic medicine, DCP (South Zone) V Satayanarayana said.