The incident occurred last night when the assailants also attacked the woman's husband and fled thereafter thinking he too had died, they said.
Kuldeep Pal (25), a resident of Ghatampur in Dukvapur village eloped with his neighbour's daughter Prabha(20) one- and-a-half-years back. After getting married, both Kuldeep and Prabha settled in Delhi, they said.
Recently, Kuldeep brought his wife to his native village for the first time after which the incident occurred, they added.
It is suspected to be a case of honour killing but police has refrained from making any such claim.
Kuldeep's relatives have accused Prabha's father and brothers of the murder. According to them, they opposed the marriage, they said.
Some of Prabha's relatives have been taken into custody, police said, adding that the case is being investigated.
