The woman was tortured to death at her in-laws’ house in Illambazar area on Thursday night, a police officer said.
According to locals, a medical test to determine the gender of the baby was conducted a couple of days ago and the attack came after the test revealed the woman was pregnant with a girl, he added.
“The husband and sister-in-law have been arrested on the basis of the complaint lodged by the deceased’s family.”
Police said they are looking for the other members of the family, including the mother-in-law of the woman, who is at large since the incident.
Prenatal sex determination is banned in India.