The FBI has arrested an employee of the US Air Force National Guard over the leaks online of classified US documents that embarrassed Washington with allies around the world. US Attorney General Merrick Garland said the FBI arrested the man, Jack Teixeira, "in connection with an investigation into alleged unauthorized removal, retention, and transmission of classified national defence information." The FBI said its agents had made an arrest and were conducting "authorized law enforcement activity at a residence in North Dighton, Massachusetts." Video images played on news channels showed heavily armed officers in Massachusetts accompanying a young man wearing a…