Islamist opposition leader Hassan al-Turabi is welcomed by supporters in his home in Khartoum, in this July 1, 2010 file photo. Sudanese security forces on January 18, 2011 arrested opposition leader Hassan al-Turabi and eight other party officials after they called for a “popular revolution” if Khartoum did not reverse price rises. REUTERS/Mohamed Nureldin Abdallah/Files