Inspector in-charge of Plant Site police station Upendra Pradhan said the three arrested were the two brothers and brother-in-law of a woman who was killed allegedly by them for eloping with a man belonging to a different community and marrying him about two years ago in the face of opposition by her family.
Pradhan said the couple never returned to Rourkela after their marriage as the woman was scared of her family members.
They, however, returned early last week after being persuaded over phone by her family members, who also promised to accept their marriage.
Police collected the bones from the cremation site and other samples for forensic investigation.
The statements of the woman's family members, specially by her brothers made the police suspicious and led to the arrest of the three mwn, the IIC said.