WASHINGTON (AP) _ The FBI has transferred 28,500 pages of documents from the bureau's investigation of the 1932 kidnapping of aviator Charles Lindbergh's infant son to the National Archives.

The documents include case files compiled at FBI headquarters during the investigation as well as the subsequent arrest, trial and execution of Bruno Hauptmann for the crime, the FBI said Thursday. The material also contains citizen inquiries, various theories about the case received after Hauptmann's execution and the government's responses to these inquiries and theories.

The National Archives will make the documents public Sept. 15 at its College Park, Md., facility.