U.S. Secretary of State Rex Tillerson will convene an accountability review board to probe the health attacks on 24 diplomatic personnel in Cuba, the State Department said Tuesday. During a Senate hearing regarding the attacks, senators from both parties slammed State Department officials for a "sluggish" and inadequate response to what Tillerson has called "targeted attacks". U.S. investigators believe American diplomats and others in Havana may have been attacked by a sonic weapon earlier this year causing them to suffer hearing loss, dizziness, headaches and fatigue. Cuba has denied involvement. After the incidents, the United States recalled a number of non-essential diplomats and their families from Cuba and expelled 15 Cubans from the embassy in Washington. State Department correspondent Cindy Saine contributed to this report.