tsarnaev and the dead man in orlando. and massachusetts state are also getting involved. >> is the fbi looking at the man in orlando and tamerlan for links? >> they both checked out martial arts and online forum and william plotnikov. the fbi has been investigating links between him and tamerlan because tamerlan came home right after that man was killed by russian forces and fbi has been check to see if tamerlan met with him while he was there in russia. >> fascinating developments on this today, susan. another terror-related story we're following, horrific murder, brazen murder on the streets of london. a meat cleaver and kitchen knife found in the bloody hands of the man accused of doing this