Sheriff's deputies say an explosion in Oregon rattled a police car, but the two officers inside escaped injury.

Capt. Spence Slater tells The Register-Guard (https://is.gd/O7Ovff ) the Junction City officers felt the concussion of an explosion Sunday night and initially thought they had been shot at.

Slater says detectives think the explosion was a pipe bomb, and don't know whether the officers were targeted or if the timing was a coincidence. It comes after a series of attacks on police nationwide.

At first, police thought the source of the explosion may have been from one of two nearby houses. A SWAT team and a military Humvee were among the officers and equipment dispatched, in case anyone responsible for the explosion was holed up.

Police concluded that no one in those houses was the culprit.

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Information from: The Register-Guard, http://www.registerguard.com