"The act is barbaric. Such incidents raise serious question on humanity," Kumar told reporters while expressing his anguish over the minor's rape which has sparked outrage across the country.
Asked a debate has again begun in the country for giving death sentence to perpetrator of such horrific crimes, Kumar, who is a senior leader of Janata Dal (United) said "it could not be a solution in one or two incident".
He was talking to reporters on the sidelines of 4th foundation day function of Bihar Roads Development Corporation (BRDC) here.
Manoj Kumar, the accused of the brutal rape case of the girl, has been arrested from his in-laws village Chiknout in Bihar's Muzaffarpur district.
Delhi police team which nabbed the 25-year-old youth with the help of Bihar police took him on transit remand to the national capital.