BBC News has heard from two sisters who beat three men they accuse of sexual harassment on a bus in India.
Mobile phone video of the incident, recorded by a passenger, has gone viral and comes amid growing concern in India about sexual violence against women.
Aarti Kumar, 22, told Sanjoy Majumder, "The boys kept attacking my sister, abusing her and refusing to stop."
"The other passengers just watched and did nothing," added Pooja, 19, "They saw us hit them, they saw us being harassed... but they just sat back like it was a performance."
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