The girl's neighbour, Deepak (20) took her to a secluded place and raped her last night, they said.
The accused also threatened the girl of dire consequences if she narrated the incident to her family members, police further said.
However, when the minor returned home and her family members saw her condition, she narrated the incident to them, they said.
Police said an FIR was registered thereafter and the accused was later arrested.