A strange accident at Epping

Saw this at Epping outside the Post Office this morning, had to take photos to show.  A car was sitting with its rear end on one of the bollards. Civil defence and police were busy trying to lift it out and eventually had to use an air bag.  How did it happen?  I could only guess that being a front wheel drive vehicle the driver had pushed the pedal a little too hard while in reverse gear. It pushed over a small tree and mounted the bollard.