The incident took place last evening in Raja Tau village when the 15-year-old victim had gone outside of his house for some work.
The girl, who was a student of class VIII, was raped and later killed by the miscreants by slitting her throat, they said.
According to the complaint filed by the father of the victim, she was being stalked by three youths since the past several days .
Meanwhile, a hunt has been launched for the youths while further probes are on, they added.