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The CIA left “explosive training material” under the hood of a Loudoun County school bus after a training exercise last week, a bus that was used to ferry elementary and high school students to and from school on Monday and Tuesday with the material still sitting in the engine compartment, according to the CIA and Loudoun County officials.

The Loudoun County Sheriff’s Office and the CIA said in statements Thursday that the explosive material was left behind after a training exercise at Briar Woods High School during spring break. The CIA said it was a training scenario for explosives-detecting dogs.

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CIA officials said in a statement that the material “did not pose a danger to passengers on the bus,” which was used on March 28 and 29. Authorities held a joint training program at Briar Woods from March 21 to 24.

Loudoun schools spokesman Wayde Byard said the CIA indicated the nature of the material but asked the school system not to disclose it. Byard described it as a “putty-type” material designed for use on the battlefield and which requires a special detonator; such putty, or plastic, explosives — including the well-known C-4 — are used in demolition and are considered stable.