A post-mortem examination of the victim on Monday confirmed sexual assault, police sources said.
The body of the victim was found on Sunday from a pit near the farmhouse of a Congress leader in Balegarh village of Yamunanagar, around 100 km from here.
The victim went missing on Saturday afternoon.
A case of murder and sexual assault has been registered against unidentified persons by police.
The victim's father, who hails from Jharkhand, is working as a farm labourer at the farmhouse of the Congress leader. The family has been living in the area for nearly six years.
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