Trimulgherry police station Inspector said the class X student's father on December 21 last year complained that his daughter was raped near Ammuguda Railway track when she went out to meet her friend.
The victim and her friend left for their places after meeting for a while. Her friend returned to home, but the victim was dragged into bushes by an unknown person. She was then brutally raped and beaten with a stick.
The man also stuffed a cloth into the victim's mouth so that she could not scream.
According to passersby, the badly injured girl was lying unconscious on the ground.
A case has been registered under Section 376 of the Indian Penal Code and Section 5 and 6 of Protection of Children from Sexual Offences Act.
The police said it had interrogated many suspects, including 12 professional criminals, who were involved in such cases earlier.
The police also questioned the victim's minor friend, and awaiting the forensic science laboratory report.(ANI)