Detailed text transcripts for TV channel - MSNBC - 20130416:14:40:00
Smarter, and sharper. we are tyco integrated security. and we are sharper. we just got a live update here in boston. investigators are still interviewing witnesses they say. they're trying to put together a time line and they're particularly asking for help from the public. and explosives specialists and forensic specialists will be brought to the scene. >> this remains a very active investigation. our ongoing investigation in various locations throughout the area goes on. however, there are no known additional threats. we continue to interview various witnesses and process the crime scene. ...