A district court in The Hague has convicted a former member of a Syrian pro-government armed group for complicity in torture and illegal arrest in Syria and sentenced him to 12 years in prison.

Judges ruled on Monday that the 35-year-old man, identified in court only as Mustafa A, was involved in the arrest of a man in 2012 in Syria. He later handed the man over to Syrian Air Force intelligence officials who ran a prison where he was tortured.

The court said the defendant was a leading member of the Liwa al-Quds, or the Jerusalem Brigade. Liwa al-Quds is an armed group, comprised mostly of Palestinian refugees living in Syria and founded during the early years of Syria’s more than 12-year war.