He reportedly had a knife and was disarmed by Gardaí.
A man in his 50s is due to face charges in connection with a public order incident at Dublin's GPO yesterday.
Gardaí say he was arrested following an incident at the post office on O'Connell Street.
He reportedly had a knife and was disarmed by Gardaí.
He's since been charged, and will appear before the Criminal Courts of Justice this morning