Three persons detained in Ranchi in connection with the Patna serial bomb blasts have been released after interrogation even as raids today continued in several areas of Jharkhand in connection with the blasts.

All the three detained after the blasts yesterday were released after interrogation last night, a senior police officer said today.

Soon after Bihar Police tipped off their counterparts here that some accused in Patna blasts hailed from the state, he said raids are being carried out.

Police recovered black powder, materials used to make IEDs, pressure cooker and extremist literature during the raids, he said.

Six persons were killed and over 83 injured in eight low intensity serial blasts in Patna of which six bombs went off in and around the venue of Narendra Modi's mega rally at Gandhi Maidan shortly before his address to a huge gathering yesterday.