Bangaluru, Nov 4 (PTI): A 25-year-old woman was allegedly gangraped by knife wielding robbers in the presence of her husband and mother-in-law at her residence here, police said today.

The woman was raped by two of a four-member robbers' gang in the presence of the family, as the accused allegedly tied their hands and threatened them with knife, Inspector HSR layout, Raghvinder said.

The four accused, all aged 21 and residents of Bangaluru, entered the victim's house around midnight and claimed to be policemen who wanted to inquire about illegal sale of intoxicants, he said.

All the four robbers were arrested on Oct 31 at Chikkaballapur and charged under Section 376D (gangrape) of the Indian Penal Code, Additional Commissioner (Law and Order) Alok Kumar said.

The incident took place on the night of Oct 24 in the city's south-east area HSR layout, but a complaint against the accused was lodged on Oct 28, Raghvinder said.

According to the complainant, the robbers threatened the husband with the sharp-edged weapon after he opened the door and barged into their residence.

They broke the almirah and looted some cash and gold valuables, he said.

Later, they tied the husband and the mother-in-law to a bed and two of the robbers gangraped the victim, while the other two helped them kept a watch around the house.

The gang also threatened the members with dire consequences if they approached police and locked the door from outside before leaving the crime scene, he said.

The accused were wanted in numerous robbery cases, while one of them had recently been imprisoned in connection with a few theft cases, police said.