The matter came to the fore when the girl, a student of standard three, complained of stomach ache and was taken to a doctor.
The doctor revealed that she was pregnant. Her parents immediately filed a complaint with ADCP city-1 Nilambri Jagdale.
A case has been registered against Lal Ji Saroj, Shankar Saroj and Kripa Shankar, and they were immediately arrested.
The accussed, in the age group of 18-20 years have been arrested.
Assistant commissioner of police (central) Ramneesh Chaudhary said, "The police would conduct medical examination of the girl on Saturday to confirm the speculations about her pregnancy."