Protests erupt in India after series of videos showing college girls being gang-raped and begging to be freed are posted online by blackmailers

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Women's rights campaigners protested in India's southern state of Tamil Nadu 

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Police said videos part of wider plot by group to blackmail sexual assault victims 

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Assault is taboo in India, and victims fear stigma or retribution if they report it.

'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.