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A worker at the Alfred P. Murrah Federal Building in Oklahoma City, places flowers and memorial items at the scene of the April 19 deadly car-bombing. More than 15 years after a fertilizer bomb was used to blow up the building, killing 168 people, the federal government is proposing to regulate the sale and transfer of the chemical ammonium nitrate.

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US to propose ammonium nitrate regulations

More than 15 years after a fertilizer bomb was used to blow up a government building in Oklahoma City, killing 168 people, the federal government is proposing to regulate the sale and transfer of the chemical ammonium nitrate.

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