The investigation agency has also obtained a three-day transit remand for him from a local court.
NIA personnel took Ujjair Ahmad with them after arresting him in connection with the Patna serial blasts case, Director General of Police Rajeev Kumar said.
Ahmad was produced before the court of Ranchi Chief Judicial Magistrate H S Jha, who granted NIA's plea to take him in remand.
The NIA was assisted by the Ranchi police to arrest Ahmed, the police sources said.