 On 8 May 2007, Haleh Esfandiari an Iranian-American scholar in Iran visiting her 93-year-old mother, was detained in Evin Prison and kept in solitary confinement for more than 110 days.She was one of several visiting Iranian-Americans prohibited from leaving Iran in 2007.In December 2008, the presidents of the American National Academy of Sciences issued a warning to "American scientists and academics" against traveling to Iran without "clear assurances" that their personal safety "will be guaranteed and that they will be treated with dignity and respect", after Glenn Schweitzer, who had coordinated the academies’ programs in Iran for the past decade, was detained and interrogated.