A team of police officers deployed at the entrance to the Mumbai Metropolitan Region Development Authority (MMRDA) grounds ahead of Modi rally stopped Mishra and detained him.
At least 18 tombstones, crosses and other structures at the 400-year-old Church have been vandalised. Ansari was tracked using CCTV footage of the cemetery.
Siddiqui was arrested under the IPC sections for unnatural sex, wrongful confinement, assault, and threatening the victim. Siddiqui has been remanded to police custody.