Tejram Singh (22) was taken away by the NIA sleuths this afternoon from Ravidas Marg area of Depalpur, 15km from here.
Earlier this month, NIA had arrested two persons -- Dhan Singh and Rajinder Chaudhary -- in connection with the case.
The bomb blast in the Samjhauta Express near Panipat, Haryana, on February 18, 2007 claimed 68 lives.