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On a day which saw the FBI release photos and video of two men wanted in connection with a pair of deadly bombings at Monday's Boston Marathon, it was a single iPhone photo, discovered late Thursday evening, that may give authorities the biggest break in the case to date.
Shortly before Piers Morgan returned to the host's chair for the week's fourth live midnight episode, a picture taken by David Green emerged as the latest piece of evidence to be released to the public.
From his home in Florida, Green shared the backstory behind a very significant snapshot:
"I contacted the FBI," he told Morgan. "They immediately knew that they had something. I had given them everything that I had, and they told me that it looks like a very good picture."
Having just completed the marathon himself on Monday, Green ducked into a store to charge his mobile device. Moments later, he heard the bombs, and had time to snap one single photo.
"I took one picture, and that was the picture."
And it's this new photo that the FBI feels gives them the best image of a man they believe to be "Suspect number two."
"I know that the images that they released were the best quality that they had," said Green, before going on to explain some of the additional information his photograph has since provided.
"I know that the photo at least shows that the suspect has a number three on their baseball cap, not kind of an enhanced number seven. And it also, I think, shows he was not wearing the bag with the bomb post explosion."
Watch the clip, and listen to the interview, then tune in tomorrow evening at 9 as Green joins Piers Morgan live to add further insight into a photograph which may help to break open the case of the Boston bombings.