Some have been trying to focus on the victims. But as information comes from both the officials and the world of social media some pieces are coming together - possibly.
The WHDH photos show what looks like a grocery shopping bag placed just outside of a barrier before and after what appears to be second the explosion. If this is the case it is surprising that no runners were seriously injured.
It is just haunting to see the innocent spectators in one image and then the carnage, the shoes, the blood, in the second.
If this is the bomb, it seems to different than the first explosion - the scene closest to the finish line across the street from the viewing stand full of VIPs. That explosion seemed to come from the inside the barrier, perhaps somewhere on the sidewalk.
And then there are the photographs released to agencies that show what appears to be a pressure cooker piece and an exploded backpack.
No official has confirmed that the bag in the WHDH photos actually contained a bomb. But if it did, could it have been just one person wearing a backpack and carrying a bag?
Suppose someone knows a friend, family member or neighbor who bought two pressure cookers lately? Do we tell someone? Is that typical? If I'd purchased two pressure cookers to can or whatever, I wouldn't mind a visit from the police or FBI.
As reported by WHDH, authorities have been asking anyone who was taking photos in the area, and not just photos of the explosion, but anytime before or after the explosions, to share the images with the FBI or local law enforcement:
The FBI and other law enforcement agencies repeatedly appealed to the public to come forward with photos, videos or anything suspicious they might have seen or heard.
"The range of suspects and motives remains wide open," Richard DesLauriers, FBI agent in charge in Boston, said at a news conference. He vowed to "go to the ends of the Earth to identify the subject or subjects who are responsible for this despicable crime."
BREAKING NFTOS NEWS: John King of CNN is reporting that a significant breakthrough is about to come in the bombing case. King has been hinting that the FBI knows who they are looking for.
Stay tuned to NFTOS as addition news comes in.