Police are believed to have gathered revealing clues from CCTV footage.
“I don't think CCTVs have failed. Some images have been captured,” Union Health Minister Ghulam Nabi Azad told reporters after a visit to the scene of attack Friday evening.
Of the three CCTVs in the area, two are believed to have captured some images which may help the police in identifying the terrorists who planted bombs near two cinema theatres.
The Crime Investigation Department (CID) began the probe after police registered two cases.
The National Investigation Agency (NIA) and forensic experts gathered clues from the sites.
Earlier, the death toll rose to 16 with two injured succumbing at two hospitals. The toll could mount further as the condition of some of the injured was said to be critical.