ABC News has posted the video online obtained from the FBI. This video shows the actual suspects in action.
The degree of confidence, the source said, comes from a "revealing" reaction Suspect 2 had to the detonation of the first bomb, which was captured on surveillance video.
Before that, the two are seen in surveillance video walking together before Suspect 2 stops at what would become the second blast site while Suspect 1 continues in the direction of the first blast site, the source said. A senior law enforcement official said one of the suspects is seen making a phone call around the time of the explosions, leading investigators to believe it may have triggered the blast.
For the complete news story, go to: http://abcnews.go.com/Blotter/special-f ... XC9ckb2Bdp
Here is the report from CBS with a different angle of the photos: the guys appear to be caucasians.
These pictures may be clearer.
http://www.cbsnews.com/2300-201_162-10016497-5.html
Still more coverage of the FBI photos
http://www.boston.com/metrodesk/2013/04 ... story.html