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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 exclusively.
Boston University graduate student Lingzu Lu has been identified by the school as the third person who died in Monday's bombings at the Boston Marathon.
Authorities have a picture of the suspect carrying a black bag near the bomb site, the Boston Globe reports. CNN says a Lord and Taylor department store security camera and a local television station provided footage that helped investigators narrow in on an individual. The Boston Globe says the suspect was spotted by the department store’s cameras at the second bombing location on Boylston Street.