Friday marks third anniversary of assassination of Osama bin Laden in Pakistan by U.S. forces . Al Qaeda is depleted , but danger of home-grown terror on rise , writes Andrew Hammond . TL;DR NEW: Al Qaeda franchises now focus more on `` local '' issues , Hammond says , threatening Western security .
Friday marks third anniversary of assassination of Osama bin Laden in Pakistan by U.S. forces . Al Qaeda is depleted , but danger of home-grown terror on rise , writes Andrew Hammond . 11,000 foreign fighters overall may have fought in Syria , from more than 70 countries . Al Qaeda franchises now focus more on `` local '' issues , Hammond says , threatening Western security .