The girl, a student of Class 10, was found hanging from a tree Sunday evening in a farm in Dasarlapally village in Ranga Reddy district, about 100 km from here.
According to police, the girl, a student of a school at Kandukur, came to the village on a holiday and went to the field for some work. A few hours later, her body was found hanging from a mango tree.
A police officer said they found a 16-year-old youth in unconscious state nearby.
Police arrested U. Naresh, who allegedly attempted to rape the girl. When she resisted, he brutally assaulted her and hanged her from the tree.
The body was sent for autopsy. The police said they were investigating if the girl was raped before being killed.
The latest incident came even as four incidents of rapes and attempts to rape were reported from different parts of the state in last two days.
A police constable and a Village Administrative Officer (VAO) in Krishna district were booked on charges of raping women in two different incidents.
In another incident, a six-year-old girl was molested by a man in Prakasam district.
In the fourth incident, a police constable tried to kidnap a 16-year-old girl in Nalgonda district with an intention to rape her. Locals foiled the cop's attempt and handed him over to police.