SIMI operative Haider Ali alias ‘Black Beauty' is among those held by the NIA team in Ranchi. Other suspects arrested in a joint effort with Ranchi police are Numan, Taufeeq and Muzibullah.
The NIA has been carrying out investigations into the case and it had nabbed Yasin Bhatkal, who had been named the main culprits behind the incident, with the help Intelligence Bureau.
The police said Black Beauty and Alam, working for the Ranchi module of the Indian Mujahideen, were also part of a group running an arms and ammunition factory at Meer Vihar in Delhi, reported media.
The NIA has been probing the eight blasts that went off during Modi's rally in Patna on October 27 last year. Eight persons were killed and hundreds injured in the blasts at the Gandhi Maidan.