Rosemount, MN (Learfield News Service) - Police in Rosemount are looking for a driver after a boulder fell off a landscaping truck and killed a mother and daughter from Shoreview.

Officers say 67-year-old Karen Christiansen and 32-year-old Jena Christiansen were driving the opposite direction of the truck Monday afternoon when an 800-pound boulder crashed through their car. The medical examiner says they both died of blunt force head trauma.

A security camera got a picture of the truck with the boulder on the back and the Minnesota BCA has identified the company listed on the door. Investigators are still trying to find the driver for questioning.