In an interview late Thursday, [David] Green, who runs a sportswear company in Florida, confirmed that the picture was genuine, and that the F.B.I. had contacted him and requested a copy. "I have spoken to several agents," Mr. Green said, "and they have got the photos, they are picking up material from me, and I don't think there's any doubt."
Agents had told him, he said, that his picture was the best they had, because it was taken from a better camera than the others that were posted.
However, TPM's Eric Lach, who's been in Boston this week covering the bombing, reached out to the FBI about the same photo earlier tonight. In response, a spokesman sort of threw cold water on it, but he also didn't address the image in particular.
"Any images not released via FBI official channels should not be considered credible," spokesman Christopher Allen wrote in the email to TPM.