NATO's Supreme Headquarters Allied Powers Europe (SHAPE) was relocated in Casteau, a village near Mons, from Roquencourt on the outskirts of Paris after France's withdrawal from the military structure of the alliance in 1967. The relocation of SHAPE to this particular region of Belgium was largely a political decision, based in large part on the depressed economic conditions of the area at the time with the view to bolstering the economy of the region. A riot in the prison of Mons took place in April 2006 after prisoner complaints concerning living conditions and treatment; no deaths were reported as a result of the riot, but the event focused attention on prisons throughout Belgium. Today, the city is an important university town and commercial centre.