PHOTOS: Explosions Rock Boston Marathon

(NEWSER– The FBI has urged the public to help as its hunt for the perpetrator of the Boston Marathon bombingenters a third day. An appeal for information has already yielded more than 2,000 tips and the FBI—which has released photos and details of the bombs that killed three and injured more than 170—has appealed for photos, videos, or any other information that could help them as they build a clearer picture of their target, the AP reports. Officials say nobody is in custody and it's not clear whether a group or individual is responsible.

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