Speculation about whether the Islamic State (IS) group is using bitcoin intensified Thursday in the U.S. when government officials said a Virginia teenager admitted to providing the organization with advice on the virtual currency.

Ali Shukri Amin, 17, pleaded guilty to charges of conspiring to provide material support and resources to IS, according to a Department of Justice statement.

Amin used Twitter to advise and encourage IS and its sympathizers, including tips on how to use bitcoin to conceal sending funds to the group. The American used the Twitter handle @Amreekiwitness, which was set up in June 2014 and grew to have over 4,000 followers. The account has since been suspended.

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