A man named Mujibul, a resident of Ormanjhi area of Ranchi, was staying on rent in the room. He is now untraceable and on the run.
Police said the Patna blasts were planned in Ranchi. The blasts took place ahead of a rally of the Bharatiya Janata Party's prime ministerial candidate Narendra Modi.
Imtiyaz and Uzair, two of those arrested in the Patna blasts, hail from Ranchi. The NIA is searching for at least four more youths of Ranchi in connection with the blasts.
A police official, however, lamented that authorities in Ranchi were not equipped to deal with terror activities.
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