6. Sana’a, Yemen
Yemen, especially its capital Sana’a, is extremely unstable following last year’s uprising against former president Ali Abdullah Saleh. With al Qaeda`s Yemeni wing and local affiliates having established presence in the region, there has been a string of assassinations of security officials. The US and its Gulf allies brokered a power transfer that replaced Saleh with his deputy, Abd-Rabbu Mansour Hadi. He launched a US-backed offensive on Islamists in the south, but situation is still far from normal.