Authorities arrest suspect in Boston bombings, source says
(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.