On Tuesday officials asked the public again to submit any video or photographs taken by spectators.
“I would encourage you to bring forward anything. You might not think it’s significant, but it might have some value to this investigation,” Colonel Timothy Alben, superintendent of the Massachusetts State Police, said at a press briefing.
One photograph that has garnered a lot of attention is an image of a man on a roof-top, allegedly at the exact the blasts occurred. Yahoo News reports the photograph was taken by spectator Dan Lampariello and later uploaded to Twitter.
CBS reports that the two bombs exploded 12 seconds apart, killing three–one victim only eight years old–and injuring at least 140 people.
When asked about viral photograph of the man on the roof, Richard DesLauriers, the special agent in charge of the FBI’s Boston Division, acknowledged the existence of the photo but did not give further details on it.
“We are processing a lot of digital photograph evidence right now as several speakers said today,” DesLauriers said Tuesday. “We encourage the continued submission of any photographic evidence that can lead to value but I can’t comment on specific tips or leads right now.”
While speculation around the mysterious photograph continues, authorities say they are interviewing several people but at this time still do not have any suspects.
For all anyone knows, the person could simply have had a roof-top view of the race.