His interest in ISIS put him under investigation, but he ultimately was caught with child porn

A Loudoun County man pleaded guilty Monday to obstructing justice and receiving child pornography in an unusual prosecution that began when he fled FBI agents investigating possible plans to commit a terrorist ­attack.

Sean Andrew Duncan, 22, will spend 15 to 20 years in prison under the plea agreement reached in Alexandria federal court, which included details not just of his Islamic State contacts but also of explicit images he had of strangers and an infant relative. Judge Leonie M. Brinkema will decide his sentence July 6.

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