Adding to the confusion, a fourth email has now emerged, reportedly from Indian Mujahideen's 'chotoo', warning of a major terror attack in Ahmedabad.
On September 8, Thursday, was the first email from 'Chotoo' who claimed it was the IM and not the Harkat-ul-Jehadi Islami (HuJI) who were behind the Delhi High Court blast.
Investigators also traced yesterday's email of Bangladesh-based terror outfit Harkat-ul-Jehadi Islami (HuJI) to a cybercafe in Kishtwar in J&K and detained for questioning its owner Mehmood Khawja, his brother Majid, their domestic help Ashwani and two others.
About the third email claiming responsibility for the blast, which surfaced today, Chidambaram said it was written 'amateurishly' but was being taken seriously by investigators.
"Third e-mail arrived today (on Friday)," Chidambaram said, elaborating that it was written in a numerical code that was deciphered 'easily'.
"Number 1 reads as A, number 8 reads as H. It seems it is hinting at the next target," he said, adding that Ahmedabad in Gujarat may have been named as the next target.
"We have sent revised advisories to states, including Gujarat," the minister said.