Ammonium Nitrate

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Federal agents are investigating the theft of 11-hundred pounds of explosives from Colorado and California construction companies in the past week. Both thefts involve ammonium nitrate. That's a key ingredient in the bomb that destroyed the Oklahoma City federal building in 1995.

The Bureau of Alcohol, Tobacco, Firearms and Explosives issued a nationwide alert Monday after eight 50-pound bags of an ammonium nitrate-based explosive vanished from the Pike View Quarry near Colorado Springs.

Then, 700 pounds of an ammonium nitrate product disappeared this week from a similar business in San Diego County, California. Authorities have not named any suspects in the thefts.