Federal investigators have joined the probe into a missing 30-ton shipment of ammonium nitrate that can be used to build high-powered explosives like that one used in the City bombing.Roughly 60,000 pounds of the chemical, which was in pellet form, vanished during a two-week journey from Cheyenne, , to Saltdale, .The shipment left a manufacturing site of Dyno Nobel, an explosives manufacturer, on April 12 and the report about the missing ammonium nitrate was made on May 10.
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