Abu Dujana has been speculated to be two people: Jamal Ahmidan "the Chinese" who was arrested after the attacks, or more likely Youssef Belhadj, a Moroccan based in Molenbeek, Belgium who in 2008 was found guilty of belonging to a terrorist group and sentenced to 12 years in prison, thought by Spanish authorities to be Abu Dujana. Belhajd, also thought to have been connected to the 2003 Casablanca bombings, was arrested in Belgium on 1 February 2005 and extradited to Spain. Convicted after the Madrid bombings, Belhadj was the leader of a Belgian cell of the Moroccan Islamic Combatant Group (GICM) along with Hassan el-Haski.