Cyber investigation involved interrogating hundreds of people, and scanning footage from over 700 CCTV cameras before they found links to the main accused Bharat Soni.
The people who did not help a 15-year-old girl in Ujjain - who had been raped and left half-naked and bleeding, and went door-to-door begging for help - may be charged under POCSO, the strict child sex abuse law, Madhya Pradesh police said.