Guardian Unlimited | The Guardian | US opens new front in war on terror by beefing up border controls in Sahara: "A small vanguard force arrived this week in Mauritania to pave the way for a $100m plan to bolster the security forces and border controls of Mauritania, Mali, Chad and Niger....West Africa is not known as a hotbed of support for Osama bin Laden's al-Qaida network but Washington is taking no chances in a region with strong Arab and Muslim ties."