washington unite state consider close embassy havana response allege sonic attack u.s. personnel cuba secretary state rex tillerson say sunday evaluation tillerson say cbs face nation program serious issue respect harm certain individuals suffer five republican senators friday call trump administration retaliate cuban government expel cuban diplomats possibly shutter u.s. embassy attack begin late 2016. state department say august americans link u.s. embassy havana experience physical symptoms incidents involve sound wave five canadians also affect symptoms include nausea dizziness temporary loss hear memory cuba unite state canada investigate attack probe yield answer carry responsible cuba deny involvement u.s. state department blame havana attack ask two cuban diplomats leave washington may tillerson say u.s. weigh close embassy cuba sonic attack