that was used in the shootout in watertown, those improvised devices were in fact constructed from elbow pipes. now, elbow pipes, that is one instruction method, rather, that comes up from time to time in "inspire" magazine which is something that has been used and promoted by al qaeda to give information about how to make a bomb. so that bit of information also is an important part of this alleged plot investigation. >> what about the suspect's level of cooperation? there has been a lot of talk from different people about how he may have stopped giving investigators information once he was mirandized. is that accurate? is that true? >> well, sources are telling me that the investigators and one official used this term were very thorough, that they got a lot of information from this young man before he was mirandized and was advised of his rights. now, while he is not talking substantively at this point, there is still communication and of course, over time, anderson, that can change and it's changed in past investigations, it could change again this time. used against police during the gun fight last week in watertown, involved an elbow where the army base used to be. jason carroll is there right now. he's outside federal medical center. you learned some new details about how tsarnaev was processed and handled when he got to the facility. what have you heard? >> reporter: well, basically what i can tell you, anderson, is that tsarnaev is in stable condition and doctors at beth