From RAND:

One significant trend is the expansion of al Qaeda’s global network. The leaders of al Qaeda in the Arabian Peninsula, al Shabaab in Somalia, al Qaeda in Iraq, and al Qaeda in the Islamic Maghreb (in North Africa) have sworn bayat, or loyalty, to al Qaeda leader Ayman al-Zawahiri and provided him with funding, global influence, and a cadre of trained fighters. None of these affiliate organizations existed a decade ago. But, over the past several years, attacks by these affiliates have increased.