sentences:  In March 2001 the GSPC was declared a Proscribed Organisation in the United Kingdom under the Terrorism Act 2000.Estimates of the number of GSPC members vary widely, from a few hundred to as many as 4,000.In September 2003, it was reported that Hattab had been deposed as national emir of the GSPC and replaced by Nabil Sahraoui (Sheikh Abou Ibrahim Mustapha), a 39-year-old former GIA commander who was subsequently reported to have pledged GSPC's allegiance to al-Qaeda, a step which Hattab had opposed.