Somalia's Frightening Network of Islamist Spies by Mary Harper – BBC News
I presume some of the people who track my movements in Somalia are part of the militant group's ruthless intelligence wing, the Amniyat. Others might be people who work on a "pay-as-you-go" basis, receiving small sums for imparting information.
Even more terrifying is the way the militants track people they want to recruit, threaten or kill.