WASHINGTON, Sha'ban 1, 1435, May 30, 2014, SPA -- The FBI investigated multiple death threats against former South Africa president Nelson Mandela during his 1990 visit to the United States and also used an informant to learn details about his trip, according to newly released documents. The FBI released hundreds of pages of records tied to Mandela's visit, which came months after the anti-apartheid leader was released from a 27-year prison sentence, AP reported. Many of the documents have portions blacked out , but they do show the FBI investigated multiple threats to assassinate Mandela during his trip, including a handwritten note that says, "Remember John F. Kennedy in Dallas???" One threat was phoned into a university in Georgia where Mandela was scheduled to address a rally. Mandela, who became South Africa's first black president after the end of apartheid in 1994. The documents were posted on the FBI website in response to Freedom of Information Act requests. -- SPA 22:39 LOCAL TIME 19:39 GMT www.spa.gov.sa/w