The victim, in her police complaint alleged that she was alone in her house last night when four friends of her ex-husband came and then raped her on knife point, police said.
They threatened to kill her if she reported the matter to anybody and then fled, a police official said.
The woman had left her first husband and two children about 6-7 months back and had been living in the area with another man whom she identified as her second husband.
Police have registered a case and launched a manhunt after her medical examination confirmed rape.