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I would imagine facial recognition software is being run on all photos / videos and crosschecked against known terrorist suspects...
Just as a matter of interest, this is how the Vancouver PD set about reviewing videos to find the perps in the 2011 Vancouver riots:
Investigators also took all their video evidence to a one-of-a-kind multimedia lab at the University of Indianapolis equipped to process large volumes of video data.
There, they teamed up with Fredericks and a response team of about 50 forensic video experts from Canada, the U.S. and Britain.
For two weeks, the analysts converted each piece of video into a standard format and then tagged the evidence by assigning numeric codes to each suspect based on their physical characteristics, such as the type and colour of clothing they were wearing.
Once all the codes were entered into a video management system, investigators could return to Vancouver and query the system to see if a person suspected of committing a crime at one location might also have popped up at other locations that same night.
The same method of cataloguing video data could be used in the Boston case, Fredericks said.
Read more: http://www.canada.com/news/Boston+b...yzing+videos/8251666/story.html#ixzz2QhclvCRL