We will arrest the main culprits behind this killing very soon,' he said.
Forensic experts were called at the crime spot and at the cremation ground to collect clues.
Rani was a school dropout while Anil was helping his parents in farming after studying till Class 12.
Police sources said they had rounded up some of the accused and their interrogation was on. The body of the boy was spotted by one of his family members in the wee hours Thursday and they informed the police.
Anil's father Rajbir Singh registered a complaint with the police.
In his complaint he alleged that the girl's father Ram Kumar, mother Bimla, uncles Satpal, Birender Singh and brothers Sombir and Ombir were responsible for killing his son.
The incident comes close on the heels of another honour killing where a 21-year-old man was lynched for marrying against the wishes of his community in Haryana's Jind district last month.