LONE TREE, Colo. (AP) -- Police are looking for a man they say crashed into a woman's car and then robbed her when she pulled over.

Lone Tree police say the woman reported that a man hit the back of her car last week with an SUV. She says when she stopped her vehicle on the side of the road the man approached her with a gun and demanded her valuables.

Police say the woman was not injured. It was unclear what or how much money the man took.

The woman described the man as white, in his mid-40s, with salt and pepper facial hair and that he was wearing a black leather bomber jacket and dark jeans. She says he was between 5 feet 10 inches to 6 feet tall.