TOYOTA SIENNA LE VAN WAS PLACED IN PARK, TURNED OFF AND KEYS REMOVED. THE GEAR SHIFT WAS ABLE TO BE MOVED OUT OF THE PARK POSITION INTO DRIVE BY A 7 YEAR OLD CHILD. THE VAN ROLLED APPROXIMATELY 400-500 FEET AND HIT ANOTHER VEHICLE AND A TREE. AFTER A QUICK GOOGLE SEARCH, I DISCOVERED A VIDEO POSTED BY ANOTHER TOYOTA SIENNA OWNER WHICH DEMONSTRATED IF YOU GENTLY WIGGLE THE GEAR SHIFT, IT WILL EASILY MOVE INTO ANY GEAR, WITH NO KEYS OR PEDALS PRESSED. I CAN RECREATE THE ISSUE EVERY TIME. SERIOUS SAFETY ISSUE AND I WANT TO PREVENT THE INJURY OR WORSE TO ANOTHER CHILD. I HAVE AN OPEN CASE WITH TOYOTA, HOWEVER AWAITING THEIR INSPECTION/ RESPONSE.