Sterling man accused of obstructing ISIS terror investigation after home raided by FBI

A Virginia man at the center of an ISIS terrorism investigation appeared in federal court on Tuesday after his home was raided by the FBI last week.

Sean Duncan's court appearance was brief as it lasted for about five minutes. The 21-year-old Sterling man appeared in a gray t-shirt with an American flag on the back along with the text, "Herndon Police Supporter."

The U.S. Attorney's Office detailed in a court affidavit that Duncan's Twitter and Facebook accounts along with an encrypted messaging app were a key part of their investigation that showed his support for ISIS. They said Duncan's Twitter handle translated from Arabic means "the Islamic State."

Court documents show Duncan has been the target of an ISIS investigation since Feb. 2016 when he and his wife traveled to Turkey.

The affidavit detailed a nearly two-year investigation alleging that Duncan discussed support for ISIS with FBI informants and researched how to make bombs and purchase weapons on the internet.

Last Friday, Duncan was at his home at the time of the FBI raid, according to the affidavit. He allegedly tried to run out of the home and get rid of a broken thumb drive and memory chip when FBI agents showed up to execute a search warrant at Duncan's home in Sterling.

Justice Department officials told FOX 5 that they were not even planning on arresting Duncan on Friday until he tried to flee.

Duncan did not face terrorism charges during his court appearance on Tuesday. Instead, he was charged with obstruction of justice.

The Virginia man will remain jailed until a custody hearing on Monday.

The Department of Justice said if Duncan is convicted of the obstruction of justice charge alone, he could face 20 years in prison and $250,000 fine.

The U.S. Attorney's Office said additional charges and other details on this case could be revealed in court on Monday.