The incident occurred yesterday when the woman's husband was away for work and the three accused, Shaukeen, Yusuf and Nafees, who belong to the same village, barged into her house, SHO Surendra Kumar Yadav said.
The woman was then raped at gunpoint, police said, adding the accused also threatened to kill the victim if she revealed the incident to anyone, he said.
The woman has been sent for medical examination, Yadav said, adding a case has been registered against the accused follwoing a complaint by the victim's husband.