The volume of these footages, which are playing a crucial role in helping investigators trace the sequence of events that led to the blasts, is huge and many of the images are not clear.
"There was a need to enhance the images. We are taking help of technical experts of a foreign-based firm for this job," a police official said.
The investigators had also found a photograph of an unidentified person at one of the locations in the CCTV footages and through enhanced image, the face of the person can be easily seen, the official said.
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