"A man identified as Manzar Imam has been arrested," Superintendent of Police Vipul Shukla told PTI.
However, he refused to give details.
The National Investigation Agency (NIA) has been searching for him for the last two years in connection with the Ahmedabad blast incident too and had come twice to Ranchi's Bariatu area looking for him in the past.
The twin blasts in Hyderabad's Dilsukhnagar had left 16 people dead.