Boston Marathon terrorist identified

Photos collated on the 4chan website show numerous images of suspicious individuals wearing large backpacks present at the scene of the Boston Marathon bombings.
Three of the men appear to be Arab or Middle Eastern in appearance, whereas another two of the individuals are white.
The images show the men looking away from the marathon runners, talking on cellphones and running from the scene immediately after the blast.
Remains of one of the backpacks are also photographed yards from where one of the bombs exploded. The FBI states that at least one of the pressure cooker devices used in the bombing was housed in a backpack.
Some of these men may have merely been victims, but the image of the two men standing together wearing the same clothes and carrying heavy backpacks and wearing credentials suggests they may have been involved in a drill or in the actual attack.
CNN is now reporting that authorities have identified one of the suspects involved in the attack by means of “video from a department store near the site of the second explosion” and “video from a Boston television station.”
The Boston Globe also reports that, “authorities have an image of a suspect carrying and possibly dropping a black bag at the second