Detailed text transcripts for TV channel - MSNBC - 20150311:19:45:00
Backpack that held allegedly one of the bombs. ron mott is in boston. >> reporter: hey, there, ari. powerful day of testimony once again. a lot of evidence going into the record here including video that was taken -- surveillance video the night that m.i.t. officer sean collier was killed. just off the stand was a surveillance video expert who saw the video and you see two figures going up to his car. you can't tell which of the two individuals fired the shots that killed him and then you see the two -- these two people leave the scene. of course because police at that point knew who they were...