A wave of student protests rocked in Tamil Nadu on Thursday after a number of videos showing sexual assaults on college girls were posted online.

Outrage increased after police said the footage was part of wider plot by a group of men to befriend college students on social media, meet them to commit sexual assaults, and then use the video footage to blackmail victims.

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"The need of the hour is to help other victims break their silence and come forward with their complaints," said Henri Tiphagne, director of human rights' charity People's Watch.

"We need to create a safe atmosphere for the other victims," said Madurai-based Tiphagne.