STERLING, Va. (AP) — Court documents say a Virginia man charged with obstructing a terrorism investigation had child pornography on a smartphone.

The Washington Post reports a search warrant executed last week says federal agents who searched 21-year-old Sean Andrew Duncan's electronic devices for ties to the Islamic State group found what an FBI agent's affidavit describes as hundreds of sexually explicit images of pre-pubescent children, including infants.

Duncan was arrested in December and accused of destroying a thumb drive that may have contained evidence of criminal activity. Duncan has been under FBI scrutiny since February 2016, when he lived in the Pittsburgh suburbs.

A U.S. Attorney's Office for the Eastern District of Virginia spokesman declined to comment to the newspaper on the possibility of child pornography charges. An attorney for Duncan declined comment.

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Information from: The Washington Post, http://www.washingtonpost.com