about hearing loss, and attacks to our diplomats, but we didn't know the details. >> pelley: catherine werner her mother traveled from the u.s. to live with her. >> werner: she spent almost three months with me. during that time, she also got very ill. and she and i shared the same symptoms. >> pelley: what sort of symptoms did your mother have? >> werner: headaches. and, ringing in our ears. we also started to both have difficulty recalling words. >> pelley: after reporting her experiences, werner was medically evacuated to the u.s. for treatment. u.s. agencies are investigating, but mark lenzi has a theory. >> lenzi: this was a directed standoff attack against my apartment. >> pelley: it was a weapon? >> lenzi: oh, of course it was a weapon. >> pelley: an energy weapon? >> lenzi: absolutely. >> pelley: what sort of energy is this that we're talking about? >> lenzi: i believe it's r.f., radio frequency energy, in the microwave range. >> pelley: a clue that supports that theory was revealed by the national security agency in 2014. this n.s.a. statement describes such a weapon as a "high-power

. >> his neighbor was catherine werner. >> it was intense pressureon both of my temples.