2002 Jeep Grand Cherokee drivetrain & axles problems

I was approaching a stop sign traveling about 30MPH in my 2002 jeep grand cherokee. When I took my foot off the accelerator, the engine continued to accelerate. I applied the brake but could not stop the car. The harder I tried to stop the car, the engine ran harder. It was like the cruise control was on and trying to maintain the 30MPH speed. The cruise was not on. I ended up inside an office building that thankfully was not occupied at the time. The car was totaled and I was injured.

Tl* the contact owns a 2002 jeep grand cherokee. While the vehicle was in park with the emergency brake engaged, the vehicle rolled backwards with the contact standing outside of the vehicle holding onto the steering wheel. The contact was unable to stop the vehicle. The vehicle stopped on its own and injured the contact, but no medical attention was required. A police report was filed. The manufacturer was not notified of the failure. The vehicle was not repaired. The failure mileage was 170,000.