really, there was only three suspects. russia, china and the cubans. the russian and chinese intelligence services operate in force in cuba. it's still believed it's possible some element of the cuban intelligence services cooperated with this. the other interesting thing we're reporting here is one of the technologies used to injure these american spies and diplomats was some kind of microwave weapon that is so sophistica sophisticated, the americans don't fully understand it. they've been testing some kinds of aspects -- >> kind of reverse engineering? >> absolutely. you know, the military has been -- the u.s. military has worked on microwave technology. apparently the russians have as well. it can make people think they're hearing sounds. that's why initially this was thought to be a sonic attack of some sort. >> what do we know about the people? were individuals targeted? was it just a group that was targeted? do we have any idea about a motive? why these people and then? >> again, these are only