It's almost 24 hours since a high-intensity blast killed 12 people and injured over 70 at the Delhi High Court and the National Investigation Agency (NIA) is focusing on tracing an email purportedly written by Bangladesh-based terror group Harkat-ul-Jehadi Islami (HuJI) claiming responsibility for the blast. Sources say investigators have traced the email to the Kishtwar region of Jammu and Kashmir, but do not rule out yet that it could be a prank.