The incident took place around two months back. The woman had called the girl to her home on some pretext, following which her brother-in-law allegedly raped her and also filmed the incident, a police official said.
The girl's father came to know about the incident recently when the video went was circulated widely.
On being asked about it, the girl told her father that she had remained silent as the accused had threatened to kill her brother if she informed anyone about it, the police said.
A case has been registered and a hunt is on to nab the accused, while his sister-in-law has been arrested, the police official said.
