Front-paged by Matt Drudge. I am going to break my policy of never linking to an Alex Jones website. Jones is sloppy in jumping to conclusions and generally a bad reporter. But the importance of these historic photos far outweighs who published them. Apparently provided by people at the race or leaked from surveillance video.
ABC News has published a photo of the backpack provided in an unclassified FBI bulletin, below.
A new security bulletin from the FBI showed images of one of the mangled, partially exploded “pressure cooker” bombs from the Boston Marathon explosions as well as a shredded backpack in which the bomb was reportedly hidden.
Of interest (which is different from "proof") are multiple photos of similar black backpacks in the crowd, which could be the evidence backpack. In one sketch below an Internet sleuth sketches out possible identifying features in one set of photos.
In another, two men wearing such backpacks are talking on cellphones and wearing the Punisher logo popular among military special ops and mercenaries.
ENTIRE SERIES OF PHOTOS FRONT-PAGE LINKED BY MATT DRUDGE: