 The South Asia Terrorism Portal cited Vikar Ahmed as a main suspect in the blast, and also noted that on 3 December 2008 Vikar Ahmed and an accomplice, Amjad were accused of firing at police officers attempting to arrest them in Hyderabad.Vikar Ahmed also stands accused of murdering one police officer and injuring three others in an attack conducted on Friday, 14 May 2010

The NIA began the probe in April 2011 after the initial investigations by the local police and the chargesheet filed by the CBI.226 witnesses were examined during the trial and about 411 documents exhibited.