The youth, Jitendra Johri, had called up Police Control Room on July 7 by identifying himself as Parabhakar and told them that a bomb was planted in the train, a Crime Branch official said.
Following the "tip off", various agencies including the GRP, police, RPF and a bomb disposal squad swung into action and searched for the explosive but in vain.
As the information turned out to be false, police started tracking location of the caller and finally zeroed in on Johri.