It's looking highly likely this guy in the white hat could be the culprit. He was seen with a backpack earlier and in the newer high resolution image he does no

It's looking highly likely this guy in the white hat could be the culprit. He was seen with a backpack earlier and in the newer high resolution image he does not appear to have his backpack any more. There could be a perfectly legitimate explanation for this: in the heat of the moment, his instinct was to run and leave his bag behind. Much like your instinct in a bad building or house fire is to run and save yourself. But then that would mean his bag would have been left behind and someone would have found it or reported it as being lost/authorities discovered it. It's not looking good for whoever this guy is and if he's innocent, it would be in his best interests now we have a high resolution photo to turn himself in before a member of the public or worse members of the public find this guy and potentially harm an innocent person out of irrational anger. Another incriminating fact is Jeff Bauman the guy who lost both legs in the blast woke up heavily drugged in the hospital and said he had looked into the eyes of a bomber (which is no doubt what helped the feds narrow down the search). Lets keep level-headed about this and assist the authorities the best we can and let them do the investigating. If we all start jumping to conclusions and taking the law into our own hands we could do more harm than good. They'll find the culprit, it's only a matter of time.