MARIETTA, Pa. (CBS/AP) – Federal authorities are searching hundreds of pounds of explosives that were stolen from a worksite in Pennsylvania.

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The Bureau of Alcohol, Tobacco, Firearms and Explosives said about 640 pounds of dynamite and 400 blasting caps were stolen over the weekend from a Gregory General Contracting Company site in Marietta.

The ATF said the explosives had been stored in a locked truck trailer when workers left the site Friday, and they discovered the theft Monday after noticing that the trailer door was ajar and the locks were missing.

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The company is a subcontractor of Williams Partners, which is managing the Atlantic Sunrise pipeline project in Lancaster County.

A $10,000 reward is being offered for information leading to the stolen dynamite.

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