Union Women and Child Development Minister Smriti Irani on Friday launched an attack at West Bengal Chief Minister Mamata Banerjee over the violence during a Ram Navami procession in Howrah and accused her of giving clean chit to those who pelted stones during the procession. "Stone pelting happened during Ram Navami`s procession in Howrah. Instead of delivering justice Mamata Bandopadhyay (Banerjee) gave a clean chit to stone pelters who took the law into their hands and attacked the Shobha Yatra of Ram Navami," Irani alleged.