While turning into a parking spot my wife had foot on the brake and vehicle accelerated over parking bumpers and into a fence and ultimately was stopped by a combination of a tree and the fence car drove through. This collision prevented her from crossing pedestrian sidewalk and continuing into Southbound traffic lane of state hwy. This incident put not only my wife at risk but also potentially any pedestrians or southbound vehicles. There were no system failures or warnings prior to my wife's arrival to her appointment. As mentioned this occurred within an approximate 5 second time frame. It is unknown as to what if any warnings occurred prior to/during the crash as my wife was pushing the brake to park when the sudden acceleration occurred. The braking system seems to have failed along with the sudden acceleration. The Automatic Braking System didn't engage, nor did the parking collision system. All our other Subaru's (including this vehicle have the collision warning and automatic braking systems) The dealership did not try to replicate the incident but all warning systems appear to be functioning correctly at this time. Following the accident I first reported the incident to my dealership where I purchased the vehicle. The initial damage estimate is forthcoming but Subaru tech indicated it will be may thousands of dollars to repair. I will follow-up next with Subaru's National Customer Care (per conversation with dealer) At the dealership (Southern Oregon Subaru)