Kurdish YPG forces operating in northern Syria claim to have captured Mohammed Haydar Zammar, a German citizen linked to the 9/11 attacks in the United States.

The YPG announced said Zammar is currently being held for his links with ISIS, a top official told AFP on Wednesday.

Zammar’s role in the 9/11 attacks is believed to be that of the recruiter.

Zammar was captured by the CIA in Morocco in 2001 and handed over to Syrian authorities as part of secret interrogations abroad. A Syrian court sentenced him to 12 years in prison in 2007 for his membership in the Muslim Brotherhood, but he was later sprung from prison by ISIS after the militant Islamic terror network overran the correctional facility where he was being held.

Zammar was born in Syria and moved with his parents to Hamburg as a toddler. His first contacts with German Jihadi groups started when he was still in high school.

In 2008. a German parliamentary enquiry was launched to look into the treatment of Zammar while he was in Syria.  Germany’s the-Foreign Minister, Frank-Walter Steinmeier, strongly denied allegations that his government conceded to Zammar’s kidnapping and torture by the CIA.