It happened just after midnight Thursday at the intersection of East Green Valley Circle and Capitol Trail in Newark.
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Police say the trooper pulled over to help a driver of a disabled vehicle on the side of the road.
That's when the driver of a sedan ran into the back of the trooper's cruiser.
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Both the trooper and the sedan driver were taken to the hospital for non-life-threatening injuries.
The driver of the disabled vehicle was not injured.