US District Judge Claude Hilton sentenced teenager Ali Amin to 136 months in prison during a hearing in Alexandria, Virginia, the US State Department said in a statement.

Amin told the judge that he did not "expect sympathy."

In June this year, the 17-year-old pleaded guilty to using Twitter and his blog to explain how to use the online currency Bitcoin to send funds for "Islamic State" militants. According to state lawyers, Amin also helped 19-year-old Reza Niknejad, also a resident of Virginia, to travel to Syria to join the IS.

The teenager, who lives in Manassas, Virginia, had some 4,000 followers on Twitter and also communicated with some well-known IS fighters, social media monitoring service SITE said.

"Today's sentencing demonstrates that those who use social media as a tool to provide support and resources to ISIL will be identified and prosecuted with no less vigilance than those who take up arms with ISIL," US Attorney Dana Boente said in a statement, referring to the IS by its other acronym.

US prosecutors have charged several people in recent months with supporting the militant group. On Thursday, state lawyers indicted an Arizona man for helping a New York college student travel to Syria to fight for IS.

The jihadist group aims to establish an Islamic caliphate and has occupied large swathes of Syria and Iraq. Its online recruiters have succeeded in luring hundreds of vulnerable teenagers in western countries and around the world to travel to Syria and fight for its fundamentalist cause.

mg/jm (Reuters, AP)