The US is to pull most of its staff from its embassy in Cuba, after reports that staff suffered "sonic attacks". The US is withdrawing about 60% of its embassy staff in response to attacks on diplomats. It is also warning Americans not to visit the country because some attacks occurred in hotels. More than 20 diplomatic staff have reported health problems. Cuba denies any involvement in the reported attacks. Last week US Secretary of State Rex Tillerson said a decision whether to shut the embassy in Havana was "under evaluation".