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Coverage of the president deeply disappointed because they have failed to pass these, even these modified background check expansion regulations. meanwhile, authorities are supposed to come out fairly soon to brief us on the latest investigation in the boston marathon bombings. we're getting conflicting word on when that might happen if in fact it will happen. but two sources do with knowledge of the investigation say authorities want to question a person seen on video, a person seen on video as a possible suspect in the attack. let's bring in our chief national correspondent john king. our se...

Explosive devices at that location of the second explosion. i repeatedly asked whether this person was in custody, i could not get further answers. but i did get from this source a clear indication that the authorities believe they have identified this individual and that that is now the focus of the investigation. i was told to expect more information to be released publicly later today, but i can tell you, wolf, from both of these sources a significant shift. last night they were saying that they had done a good job with the forensics, a very good job of reconstructing how this happened and ...

5:00 p.m. eastern with the fbi, local police, the governor, the mayor and others. they'll tell us what they can at that time. in the meantime, your breaking news. >> i was told by one source this morning a boston law enforcement source that they believe they had a breakthrough of significant progress in the investigation. this source declined to be much more specific just said as the analysis continued, and we know the analysis was centered on video analysis, all the camera stuff turned in by local television stations, individuals, video and still photos. i was told there was a much better moo...

Breakthrough came from video analysis right up the street here of a department store later identified as the lord & taylor department store, which is very close to the site of the second explosion. >> you were just a block away from there. >> and i'm told because of that video and i'm also told video given by a boston tv station was helpful into corroborate that and match things up, timing, sequencing, framing if you will. but largely from the department store surveillance video that they actually got what they were looking for, wolf, which was an individual coming in and placing. and then wal...

Find additional information about that. but that is part of the forensics and physical evidence, but i'm told from the video analysis that they now have what they believe to be clear video image of a suspect approaching the site, placing a package and leaving the site and placing a package that matches the description of what they have been looking for, the size of the package, the black bag and like and they have those images now being analyzed and to such detail i am told that they believe they have a clear identification including a facial image of a suspect. the question i have been unable...