Purnia superintendent of police Nishant Kumar Tiwari said today the incident took place Friday last at Rangpura Dakshin village under Mirganj police station area.
The 33-year-old son of Rangpura panchayat sarpanch Azhari Khatun allegedly took the girl to a mango orchard and raped her.
The 10-year-old girl was found writhing in pain by a passerby who informed her family, the SP said, adding the victim was rushed to the Sadar hospital.
Rocky Yadav, son of JD(U) MLC Manorama Devi shot dead a youth in Gaya on May 7 in an incident of road rage. Both Yadav and his father are behind the bars, while the MLC, from whose house about 18 bottles of liquor were found in violation of the total ban in the state, is absconding.