An Alaska man has been arrested on charges that he threatened to assault, kidnap and murder six U.S. Supreme Court justices and some of their family members in online messages that contained violent and racist language.

The indictment does not specify which justices were targeted, but Attorney General Merrick Garland said he made the graphic threats as retaliation for decisions he disagreed with.

It remained unclear whether the man, Panos Anastasiou, came close to carrying out his threats, and public records indicate that he is not affiliated with any political party.