A man believed to be in his early thirties was seen reaching the area at 6.38 pm with a bag hung to its carrier, 10 minutes before the blast at Anand Tiffin Centre in front of Konark theatre. The second blast took place at 7.01 pm a few meters away. The bombs at both the places were planted on old bicycles. (Read: CCTV may hold vital clues)
The Director General of Police (DGP), Andhra Pradesh, Dinesh Reddy said the footage was being enhanced and he was hopeful of a breakthrough soon.
"CCTV of the traffic police... there was a very good clue and we are working on it. The footage is not that clear but we are enhancing its quality. I've heard there was a breakthrough in the quality of the footage, perhaps the success could be for us," Mr Reddy told NDTV.
Though the CCTV camera is focused on the vehicles moving on the main road and not towards the corner where the blast occurred, the image of the suspect on bicycle could prove a vital clue in the investigations, sources said.
The police on Friday announced a suitable reward for anyone providing information about the suspect. Cyberabad Police Commissioner D Tirumala Rao said the identity of the person would be kept a secret. He said the reward could be anywhere between Rs. 5 lakh to Rs. 20 lakh depending on the investigations.
Meanwhile, the condition of the injured remained critical. The injured are undergoing treatment at seven hospitals including state-run Osmania Hospital.