WASHINGTON (AP) — A federal appeals court has sided with reporters in a court fight over documents that began after an FBI agent pretended to be an Associated Press journalist while investigating bomb threats at a Washington state high school.

When the ruse became public in 2014, the AP and a press freedom organization attempted to get government records about the case and any other times FBI agents have impersonated journalists. After initially getting no records from the FBI, the AP and Reporters Committee for Freedom of the Press sued. Though some documents were produced, the organizations...