The police remand of Moninder Singh Pandher and his servant Surendra Koli, accused of the gruesome sexual abuse and killing of at least 17 children, was on Monday extended till January 10.

The remand magistrate of Gautam Buddh Nagar court granted the police custody of the 2 accused for 10 more days as the investigators said further interrogation was required to complete the recovery of the human remains of the victims.

The court also granted the police plea for narco-analysis tests of the duo, whose two-day remand had ended on Monday.

Police have yet to zero in on one of the three labs at Hyderabad, Ahmedabad and Bangalore for the narco-analysis tests.

The accused were not represented by any lawyers on Monday.