A youth was on Sunday arrested at Bhabuaara village in Bihar's Madhubani district in connection with the July 11 Mumbai serial blasts.
Badrul Zama, brother of Kamrul Zama who was arrested earlier in Mumbai in the same case, was arrested by a joint team of Mumbai police, Intelligence Bureau and the district police.
Sources in the district police said Zama had been taken to some unknown destination for questioning.
He worked in a factory in Mumbai, the sources said.
This was the third arrest made from Madhubani in connection with the blasts in the Mumbai local trains.
While one Khalid Aziz was arrested from Malmal village under Kaluahi police station, Mohammed Kalam was arrested at Basopatti Bazaar in the Basopatti police station area on July 21.
