Five Indian anti-trafficking activists performing a street play were gang-raped at gunpoint in the eastern state of Jharkhand, police have confirmed.
The women were working with a non-governmental organisation (NGO) to raise awareness about human trafficking in the remote Khunti district.
About 40,000 rape cases were reported in India in 2016.
Many cases, however, are believed to go unreported because of the stigma that is attached to rape and sexual assault.
Scrutiny of sexual violence in India has grown since the 2012 gang rape and murder of a student on a Delhi bus. This latest incident comes as the country continues to reel from a string of recent attacks.
Jharkhand has also been in the spotlight recently after three teenage girls were raped and set on fire in separate incidents in May.