While one 14-year-old boy has been arrested from Kolkata, two other students - Shariq and Abid have been detained from Jammu Kashmir's Kishtwar region.
The two boys have been sent to remand for 10 days and will be questioned over their connection with the terror mails which was received by the Delhi police soon after the blast claiming responsibility n behalf of the terror group HuJI.
Union Home Secretary said, "Some people have been arrested and are being questioned. There are some leads in the case but I can't disclose this at this point of time. There is some progress."
However, the boy from Kolkata - Sunny Sharma believed to have sent the second and fourth emails for just "excitement". Sharma also was being taken to Delhi for further inquiry.