In a letter to several leaders in Congress, Comey announced a renewed investigation into the home email server Clinton used while secretary of state after discovering pertinent emails "in connection with an unrelated case".
"The FBI has learned of the existence of emails that appear to be pertinent to the investigation," Comey wrote, adding the FBI learned of these emails "in connection with an unrelated case".
The Metropolitan police said the man was arrested in Gloucester in connection with an investigation into "malicious communication and threats made via email and a social networking site".
"Since my letter, the FBI investigative team has been working around the clock to process and review a large volume of emails from a device obtained in connection with an unrelated criminal investigation," Comey wrote to Congress on Sunday.
One police department employee has been fired and two others are on administrative leave awaiting a final ruling on their fate in connection with a series of racist emails exchanged by city workers, he said.
"In connection with an unrelated case, the FBI has learned of the existence of emails that appear to be pertinent to the investigation," Comey wrote.
In his letter on Friday, Comey wrote, "In connection with an unrelated case, the FBI has learned of the existence of emails that appear to be pertinent to the investigation.
The new emails turned up as FBI investigators were examining electronic devices used by former Democratic Representative Anthony Weiner in connection with an alleged "sexting" scandal.
The Associated Press in New York contributed to this report Until 2010, few people had heard of Fabrice Tourre but from the moment Goldman Sachs released some of his emails in connection with a US Senate investigation into the causes of the financial crisis, the French-born trader became famous as "Fabulous Fab".
Until 2010, few people had heard of Fabrice Tourre but from the moment Goldman Sachs released some of his emails in connection with a US Senate investigation into the causes of the financial crisis, the French-born trader became famous as "Fabulous Fab".
