Two other suspects, identified as Tausim and Imtiaz Ansari, were arrested soon after the bomb blasts in the Bihar capital on Sunday.
Director General of Police Rajeev Kumar had said that six persons were detained for interrogation in connection with the serial blasts set off at and near the Gandhi Maidan ahead of the rally addressed later by BJP's prime ministerial candidate Narendra Modi.
Six persons were killed and 82 others injured in the serial blasts at the Gandhi Maidan and surrounding areas.
