Nearly three tons of stolen ammonium nitrate are unaccounted for in North Carolina, even as the U.S. braces itself for a possible al Qaeda truck bomb attack. Mixed with fuel oil, ammonium nitrate is a favored ingredient used in al Qaeda truck bombs. Nearly a month after the theft was reported, 59 bags of the volatile fertilizer is still unaccounted for. The unsolved theft from a North Carolina facility looms large as local and federal authorities responded to a Department of Homeland Security bulletin warning that al Qaeda may be planning a truck bomb attack against U.S. financial centers in New York City and Washington, D.C. Full Story