Or into flight mode???
Hard to say what hapened at this point...
But a few years ago we had a similar accident in YVR (that's Vancouver, Canada) when doind a ground run on an A310. They only put in Line Mtce chocks during the run... (AIRBUS has special Ground Run Chocks, that can't be jumped. (I'd guess they didn't use 'em here either...). The coneheads (avionics mechanics) were messing with CB's during run and pulled a breaker that put the aircraft into flight mode...
Presto! Engines to flight idle, no reverse thrust, no brakes & no steering... It jumped the chocks so fast the mechanics in the left and right seats didn't even know what happened (they didn't even know the coney's were messing around with the CB's) They are busy trying to steer, brake, reverse -- ANYTHING... Uncontrolled taxi -- right into a ground equipment building -- hard enough to shear off 6" steel I-beams.
Over $1 million CDN damage...
If I was a betting man, I'd guess something similar happened here...
Damn! I hope those mech's/ground crew are okay...