JACKSONVILLE BEACH (CBSMiami/AP) — A Florida man, in Boston for Monday’s marathon, unknowingly snapped a picture of one of the bombing suspects leaving the scene in a crowd of people.

David Green of Jacksonville Beach told The Associated Press he finished Monday’s race about an hour before the twin blasts. He said he and friends were watching the rest of the race when he went to a nearby store to charge his cellphone.

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While he was returning, the bombs exploded. He snapped a photo, put the phone back in his pocket and went to help the injured.

Green’s photo shows the suspect at a side angle leaving the bombing scene.

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“I spoke to the FBI and it may be the best photo they have,” Green posted on his Facebook account.

It wasn’t until Thursday that he knew what he had: a picture of one of the suspects, Dzhokhar A. Tsarnaev , wearing a distinctive backward white baseball cap and walking away from the scene.

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