LUCKNOW, Jan. 31 -- The Lucknow police arrested a key figure connected to a disputed nikahnama (Islamic marriage document) in Pilibhit district as the investigation into allegations of sexual exploitation and forced religious conversion involving a suspended resident doctor linked to King George's Medical University (KGMU) gathered pace, officials said on Friday.

Shariq Khan, a resident of Neuria in Pilibhit, was taken into custody on Thursday night and arrested on Friday after days of surveillance, said Nagesh Upadhyay, the inspector incharge of Chowk police station.

Khan, an accused in the FIR, was arrested after his involvement was established during the investigation, the police officer added.

Khan's name surfaced during the interr...