On the complaint by the victim's family, a case has been registered in this connection with Motipur police station, police sources said.
A 45-year-old mechanic Kamrul Hooda has been accused of raping the girl, who had gone to field to relieve herself.
Barely few days back, Manoj Kumar, the prime accused in Delhi rape case victim, was arrested from Chicknouti village of Muzaffarpur.
The police are conducting raids in search of Hooda, sources said.