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(CNN) - [Breaking news update at 1:47 p.m. Wednesday ]
An arrest has been made in the Boston bombings investigation based on two videos showing images of the suspect, a federal law enforcement source told CNN's Fran Townsend.
[Breaking news update at 1:28 p.m. Wednesday ]
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.
[Original story, posted at 1:11 p.m. Wednesday]
(CNN) -- 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.
The 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, said the source, who declined to be more specific but called it a significant development.
Earlier, a federal law enforcement source with firsthand knowledge of the investigation told CNN that a lid to a pressure cooker thought to have been used in the bombings had been found on a roof of a building near the scene.
While such clues may move the investigation forward, they did not reveal whether the attack was an act of domestic or foreign terrorism.
"If your experience and your expertise is Middle East terrorism, it has the hallmarks of al Qaeda or a Middle East group," former FBI Assistant Director Tom Fuentes said. "If your experience is domestic groups and bombings that have occurred here, it has the hallmarks of a domestic terrorist like Eric Rudolph in the 1996 Atlanta Summer Olympics bombings."