US guardsman appears in court over leak of highly classified military documents

Jack Teixeira, in T-shirt and shorts, was taken into custody by armed tactical agents on Thursday (WCVB-TV via AP)

A Massachusetts Air National Guardsman arrested over the leak of highly classified military documents has appeared in court in Boston.

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