[5] The attack took place while Indian Prime Minister Manmohan Singh was on a historic two-day official state visit to Bangladesh, to discuss Bangladesh–India relations.

[2] In an email attributed to HuJI, the group is alleged to have demanded that Mohammed Afzal Guru, convicted for the 2001 Indian Parliament attack, should not be hanged as ordered by the Supreme Court.

[11][20] A separate investigation was set up by the Delhi Police Department after the Intelligence Bureau said that only one input[clarification needed] was received, which specifically cited Muslim extremists who are supporters of the Khalistan movement and may conduct illegal activities in the city.

[21] On 7 October, the National Investigation Agency arrested a medical student from Kishtwar, Jammu and Kashmir named Wasim Akram Malik, who they claimed was a key conspirator of the blast.

[22][23] Kashmiri Wasim Akram Malik, a student of Unani medicine in Bangladesh,[24] was arrested from the Indo-Bangladesh border, on basis of leads derived from other detained suspects.

[22] Public Relation Officer (PRO) Defence, Col R K Palta claimed killing of two terrorists on 6 August 2012 in the Trothil forest area of the Kishtwar district.

Deputy Inspector General (DIG), Kishtwar-Doda-Ramban range claimed that Amir Ali is the prime accused in the Delhi High Court blast.

Prime Minister Manmohan Singh, while on a two-day stay in Dhaka, remarked: "I just heard the sad news from Delhi about the bomb blast.

"[28] Indian Home Minister P. Chidambaram said the blast was likely a job of local militants and remarked that "India was concerned about how to prevent the radicalisation of its youth.

"[29] Indian Muslim religious leaders[vague] termed the blast as an act against humanity and suspected that it could be a deep conspiracy to destabilize the secular system of India.