He said Bihar government has asked the NIA to take over the probe in the serial blasts targeting Narendra Modi's Sunday rally that had left six people dead and over 80 injured.
Addressing his party JD(U) convention here, Kumar condemned the serial blasts in Gandhi Maidan on Sunday.
"I had asked authorities to take proper security arrangements at the rally venue. I had told the top police officer to ensure the security of the massive rally that is scheduled."
"I have requested NIA to take over the investigation in the serial blast in Patna," he said.