Investigators believe they have identified a suspect in the Boston Marathon bombings, a source who has been briefed on the investigation told CNN's John King.
The source said what officials believe is a breakthrough came from analysis of video from a department store near the site of the second explosion. Video from a Boston television station also contributed to the progress, this source said.
From that analysis, the source said, authorities believe that they have identified a suspect.
The source declined to be more specific but called it a significant development.
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