Osama bin Laden is dead but al-Qa'ida remains the CIA's 'number one threat'. With branches in strategic hotspots from Yemen and Somalia to North Africa and an increasing influence among 'home grown jihadis' in the West, journalist and al-Qa'ida expert Abdel Bari Atwan investigates how the organisation has survived all attempts to destroy it. Al-Qa'ida after bin Laden has expanded its reach by cementing new alliances and exploiting the opportuniti...