In an interview to a TV channel, Chidambaram said the investigators have found that it was a SIM card purchased and put in a GPS activated mobile phone from which the e-mail, owing affiliation to terror group Indian Mujahideen, was sent.
"So we have leads but we have to zero on the particular person who sent it. There is nothing in the email itself which directly links it the shooting near Jama Masjid," he said.
Chidambaram said the e-mail seems to have been prepared many days in advance and it makes no direct mention of the shooting.
Two unidentified persons on a bike fired at a tourist bus near the gate number 3 of the Jama Masjid in New Delhi on Sunday, Sep 19, in which two foreign tourists were injured.