The accused, identified as Hariram Bishnoi of Mumbai's Kalachowkie area, was near Churchgate station on Friday afternoon just before the alleged crime took place.

The victim had come to the station to drop a relative. She was waiting with another family member on the footpath outside the station's entrance.

The accused then came up to victim from behind, opened his pant zip and started masturbating. He then brushed past her as he left the area.

The woman was initially unaware about what was happening. It was only some time later that she felt something wet and sticky on her clothes.

At just about the same time, a bystander approached the woman saying he had recorded the whole incident on his mobile phone.

The bystander and the woman then called the Mumbai Police control room, which dispatched officers to the spot.

Police personnel then reached the location and managed to nab the accused, who was just a little ahead.