Guardsman accused over records leak to appear in court

Investigators believe Teixeira was the leader of an online private chat group where the documents were shared.

Jack Teixeira is taken into custody by armed tactical agents (WCVB-TV/AP)

A Massachusetts Air National Guardsman arrested over the leak of highly classified military documents is expected in federal court on Friday as the US justice department prepares to outline the criminal case against him.

Jack Teixeira, 21, was arrested by heavily armed tactical agents on Thursday following a week-long criminal investigation into the disclosure of highly sensitive government records.