The National Archives released thousands more documents related to the assassination of President John F. Kennedy on Tuesday, more than 60 years after his death and two months after President Donald Trump signed an executive order to declassify the documents.

The majority of files regarding Kennedy’s assassination have already been declassified. The remaining files likely remained classified due to sensitive information, which could include the names of informants who may still be alive and potential safe houses or black sites that may still be in use.