Modi said none of the wrongdoers under BJP-JD(U) government will be spared.
The deputy chief minister said that the suspended BJP leader Manoj Baitha, an accused in the case will be properly interrogated.
Speaking to ANI, Modi said, "Why a government will try to save a person who has killed nine children? This is not the RJD, who keep leaders like Sohrabuddin and Raj Ballabh Yadav, who are accused of many cases."
"We have suspended him (Baitha) from the party and this is due to police strictness that the accused surrendered himself. Our government ensures proper law and order. We will take strict action against him," he added.
However, Baitha earlier in the day denied driving the vehicle which mowed down nine children.
Baitha told ANI, "I am very sad to hear about the death of children. I surrendered on my own."