28/12/2013 09:49 GMT | Updated 25/01/2014 16:01 GMT

Sinh Vinh Ngo Nguyen, Man Who 'Used Facebook To Contact Al Qaeda', Pleads Guilty To Terrorism Charge

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Bloomberg's Best Photos 2013: A Facebook Inc. logo is displayed for a photograph in Tiskilwa, Illinois, U.S., on Tuesday, Jan. 29, 2013. Facebook Inc. is scheduled to report quarterly earnings on Jan. 30. Photographer: Daniel Acker/Bloomberg via Getty Images

A man is facing 15 years in prison after he admitted to offering to help al Qaeda on Facebook.

Sinh Vinh Ngo Nguyen, 24, tried to assist the terror group by saying he could provide weapons training for them, a court heard.

He pleaded guilty to a terrorism charge in a US court and now faces a maximum sentence of 15 years in prison.

Nguyen was caught by an undercover FBI agent posing as a recruiter for al Qaeda on the social media site.

Assistant US Attorney Judith Heinz said Nguyen underwent 50 hours of interrogation during which he confessed to his plan.

"Nguyen admitted that approximately one year ago he travelled to Syria where he joined opposition forces," the court heard.

"Using a social network site during a four-month period he was in Syria, Nguyen told people that he was fighting against the Assad regime and that he had had a 'confirmed kill'."

Nguyen returned to the US, where he told associates he had offered to train al Qaeda forces in Syria but was turned down.

The judge who accepted the guilty plea had previously expressed scepticism about whether Nguyen had any special skills to offer the terror group.

Nguyen is due to be sentenced in March.