A Police Officer's Ford Explorer Interceptor Hybrid SUV while driving had a vehicle malfunction where the rear wheels began to wobble/vibrate and while driving in a straight line with front wheels facing straight caused the vehicle to fishtail out of the control (loss of control to the rear wheels) and slam into a tree at approximately 50mph injuring the officer. Officer's injuries were broken left leg and two knee fractures. Upon further research, this incident may have been caused by the "rear bolt" fracture issue Ford is having with these specific Ford Explorers. This specific vehicle is under recall per the VIN. The Officer's safety was put at risk because the vehicle was most likely not recalled and fixed per the recall. The vehicle has not been inspected by manufacturer or any qualified/certified individual. No other issues or symptoms were present prior to this incident. The vehicle is available for inspection upon request with the BART Police Department in Oakland, CA.