A builder drove a digger through the doors of a Liverpool hotel before leaving a scene of chaos inside.
Onlookers shouted at the driver to stop as the machine mounted the steps of the Travelodge, sending debris flying as it crashed through the doors.
Footage shows a bystander banging on the side of the cab, but the driver ignores pleas to halt the rampage as the digger rams the reception desk and windows.
Merseyside Police is investigating.
A witness, ceiling fixer Samuel White, 24, said the driver was involved in a pay dispute over £600 with contractors at the hotel, which is under construction.
Mr White said: “The handover was today. Everything completed, we’d put the last tile in, cleaned up and made sure everything was perfect.
“Then some idiot in a mini digger decided to drive through the middle of the building.”
Mr White said the destruction went on for “a good 20 or 30 minutes” before the driver left the vehicle and ran off.
“There were loads of workers outside all gobsmacked, jaws to the floor wondering what’s going on,” said Mr White.
“The site manager was running around like a headless chicken, he wasn’t happy at all.”
The digger was eventually driven out of the building, leaving a tangled mess of steel and broken glass in its wake.
It moved down the steps and across a car park before the driver was seen leaving the cab.
Police arrived at the hotel, which is based at Liverpool Innovation Park, at 1500 GMT.
They said one man was treated at the scene by North West Ambulance Service for irritation to his eyes caused by exposure to diesel.
Merseyside Fire and Rescue Services and contractors from the construction company attended to ensure the site was safe.