A Kosovo citizen is set to enter a guilty plea on charges of hacking computers to expose U.S. service members’ personal data on behalf of the Islamic State.

Ardit Ferizi’s is scheduled to appear at a change-of-plea hearing Wednesday in federal court in Alexandria, Virginia. He initially pleaded not guilty to charges of providing material support to terrorists and identity theft.

Prosecutors say Ferizi hacked the records of a private company and provided names, email passwords and phone numbers of more than 1,300 service members to the Islamic State last year. The Islamic State then published the data on Twitter with a warning it would “strike at your necks in your own lands.”

Ferizi was arrested in Malaysia in October and brought to the U.S. to face charges in January.

(AP)