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The Boston Marathon bombing investigation, now in its third day, is not just the largest crime scene in the city's history — it's the most crowdsourced terror investigation in American history. With the FBI, the ATF, and Boston law enforcement soliciting videos, cellphone pictures, and anything that could lead to the capture of whoever set off those pressure cooker bombs, the plea has more or less turned the interested and the Internet into amateur investigators armed with what we know the remains of the bag and the bomb look like. On Reddit, where they can now apparently track murder by way of Google Maps and where some of the most detailed information on the Boston case has surfaced publicly, the FBI's plea for info has spurred the "Find Boston Bombers" subreddit, with all kinds of analysis. But here's the find they're most excited about: They've found a photo of a man with a backpack that has straps which resemble what federal officials believe is the detonated backpack. (Update: Authorities appeared to have a suspect — follow here. Update 2: Now they actually have a suspect — two of them — and Reddit is on the case.)

We have obscured the man's face because, well, the only suggestion of a connection to the bombings comes from people on Reddit who have been looking at photographs:

And one more angle, showing extreme close up of the straps.

Again, we can only vouch for the image of the detonated bag, which the FBI says contained one of the pressure cooker bombs. There are no details on where the image of the man in the blue jacket came from, or at what time it was taken during the marathon, or the location— the only reference we have is that it trickled down from social media and Flickr, and down to sites like 4chan and Reddit. Redditors, to their credit, haven't been shy in voicing the skepticism and concern with pinning this terror attack on an innocent man: