From The Wall Street Journal:
NOUAKCHOTT, Mauritania -- Al Qaeda-affiliated rebels are spreading far beyond their original battleground in Algeria and increasingly threatening Africa's Sahara belt, scaring away investors and tourists as they undercut the region's fragile economies.
Dozens of security personnel, as well as an American aid worker and a British tourist, were killed by militants in several attacks in the region this summer alone. The attacks -- which prompted this year's lucrative Paris-Dakar car race to relocate to South America -- have become more frequent and brazen. Recent hits occurred not just in the remote desert but also in Mali's tourist magnet Timbuktu and in the Mauritanian capital Nouakchott, where a suicide bomber attacked the French Embassy last weekend.
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My Comment: One look at the above map says it all. The region in question is huge and desolate. A perfect place for an insurgent group to operate.