advisory strong language paragraph 16 may offensive readers arshad mohammed sarah marsh washington/havana unite state friday cut diplomatic presence cuba half warn u.s. citizens visit mysterious attack cause hear loss dizziness fatigue u.s. embassy personnel u.s. embassy havana halt regular visa operations cubans seek visit unite state offer emergency service u.s. citizens step may erode u.s.-cuban rapprochement begin former president barack obama partial evacuation depict safety measure send message u.s. displeasure cuba handle matter deliver another blow obama policies engagement cold war foe cuba communist party-run cuban government already deal several delicate matter aftermath hurricane irma steep decline aid important socialist ally venezuela political transition president raul castro step next year cuba foreign ministry chief u.s. affairs josefina vidal say consider decision announce today u.s. government state department hasty affect bilateral relations vidal brief state-run television say cuba still keen cooperate u.s. authorities clarify happen officials president donald trump administration stress unite state maintain diplomatic tie cuba twenty-one u.s. embassy employees cuba injure report symptoms hear loss dizziness headache fatigue cognitive issue difficulty sleep state department say government cuba ensure safety diplomats cuba embassy reduce emergency personnel order minimize number diplomats risk exposure harm secretary state rex tillerson say statement cuban government deny role investigate federal bureau investigation look incidents u.s. law enforcement official say far determine cause senior state department official say neither u.s. cuban governments able identify responsible stress government cuba responsible take appropriate step prevent attack diplomatic personnel cuba travel warn state department bluntly say personnel safety risk unable identify source attack believe u.s. citizens may also risk warn travel cuba state department official say visa process suspend havana cuban applicants nonimmigrant visa may apply another u.s. embassy consulate overseas state department say attack u.s. embassy personnel occur u.s. diplomatic residences hotels frequent u.s. citizens tourists know injure attack canada say plan change travel advice cuba remove canadian staff embassy though staff experience unusual symptoms spokesman foreign affairs minister chrystia freeland say friday diana rodriguez 52 sell handicrafts old havana say visa appointment october could visit family live florida ever go say furiously really strong blow affect regular cubans street unheard go man neither bush father sons bitch trump june vow partially roll back detente cuba agree democratic predecessor obama call cuban government corrupt destabilize address unite nations general assembly month engage cuba washingon-based lobby group say decision puzzle give american travelers target say halt visa process cuba discourage americans go divide families harm cuba burgeon private sector civil society group efforts improve human right island felt danger people friendly safe culture ... feel threaten think really safe place american visitor joey branch say u.s. lawmakers take position issue appear reflect wide perspective engagement havana senator patrick leahy democrat favor normalization suggest attack may attempt undermine whoever obviously try disrupt normalization process unite state cuba someone government try reverse process leahy say statement marco rubio florida republican frequent critic cuban government call harsh measure responsible attack bring justice u.s. immediately expel equal number cuban operatives downgrade u.s. embassy havana interest section consider re-listing cuba state sponsor terrorism rubio say statement american tour operators cuba count 50 u.s. company criticize travel warn motivation u.s. government issue today travel warn cuba difficult understand give facts circumstances mysterious incidents never pose tangible threat american visitors cuba american airlines unite airlines apply additional flight havana say travel warn would affect current operations cuba jetblue airways say would waive change cancellation fee cuba flight book sept. 29. airbnb spokesman nick papas say operations cuba would continue cuba report four million arrivals last year 285,000 americans u.s. cut staff cuba mysterious injuries warn travelers