United Nations peacekeepers in Mali discovered an enormous cache of explosives while on patrol near Kidal, the troubled northern city that was the birthplace of last year's Tuareg rebellion, AP reported. A statement issued by the U.N. mission said peacekeepers discovered the 5.7 metric tons of ammonium nitrate and around 40 grenades during patrols in late September in the Kidal region. Spokesman Olivier Salgado said the quantity of ammonium nitrate found could be used to make between 20 to 25 suicide car bombs.