I PARKED MY X5 ON AN INCLINE, PUT THE CAR IN PARK, SET THE PARKING BREAK AND TURNED THE VEHICLE OFF. LOCKED IT AND WENT INSIDE. THERE WERE WORKERS OUTSIDE FOR ABOUT 10 MINUTES BEFORE COMING IN TO THE HOUSE THAT WITNESSED IT SITTING THERE FOR THAT AMOUNT OF TIME. AFTER BEING INSIDE FOR ABOUT 5 MORE MINUTES OR BETTER, I WENT TO LEAVE AND FOUND THAT MY CAR HAD ROLLED AND HIT A TREE. THE PARKING BREAK WORKED SEEING THAT THERE WAS SNOW BUILT UP ON THE BACK TIRES, HOWEVER, YOU CAN SEE FROM THE PICTURES THAT BOTH FRONT TIRES ROLLED. BMW LOOKED INTO IT AND SAID THE CAR DIAGNOSTICALLY CHECKED OUT FINE AND THAT IT IS NORMAL FOR BOTH FRONT TIRES TO ROLL WHILE IN PARK???