The National Investigation Agency (NIA) on Thursday detained a person named Mohammad Aftab Ansari in connection with Patna blast case.
According to reports, Aftab was detained while he was travelling to Delhi from Muzaffarpur.
He is being interrogated by the NIA to get some more crucial clues in the case.
The Agency hopes to find some substantial clues from the laptop recovered from Aftab.
Three people were earlier arrested in connection with the blasts.
A bomb exploded on platform No 10 on Sunday morning, ahead of the rally of the Bharatiya Janata Party (BJP) which was, hours later, addressed by the party’s prime ministerial candidate, Narendra Modi.
The first of the blasts ripped through a toilet around 10 am at the railway station in the heart of the city, killing one person and wounding another.
After an hour, by which time Modi had reached Patna but was not yet at Gandhi Maidan, the venue of the rally, four explosions occurred inside the maidan. Two bombs exploded in the vicinity of the maidan, spreading panic.
Six people were killed and 83 others injured as seven bombs exploded in Patna on October 27.
—-IANS