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Weapon. patrick oppmann has been following the story from havana where the attacks first started. what is the evidence here, what happened at the embassy that led authorities to suspect it was this kind of attack? >> you had very precise attacks, u.s. officials say always in diplomats' homes or hotel rooms and calls them to have brain damage, things that -- injuries that resemble concussions but no outward signs of any physical injuries. so how do you explain a concussion when no one can -- actually point to injuries they sustained. and they thought it could be a sonic weapon, they backed off ...

Release more information about this. right now it may be one piece of still a very big puzzle. >> it is mysterious, but you know, there are a couple things from that reporting that there is some place of blame or at least looking seriously at russia. then the other is it's not just a very disturbing high-pitched noise, but there might even be voices or a message, a continual message that people have been victimized by this sound. what more do we know about that, or who is adding any credence to that? >> reporter: it's really fascinating stuff. there are a number of countries, including the for...