 Complete the following phrase:  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 