The girl — a student of class 5 in a government school — was taken to the AIIMS trauma centre, where a medical examination confirmed rape.
Kumar told the police he had sexually assaulted the girl for the first time in December 2011 and again in January this year.
“Every time, Kumar would threaten the victim with dire consequences if she complained against him. A case of rape has been registered and the investigation has begun,” the officer said.