A truck has tipped up on its end outside the New Zealand Campus of Innovation and Sport in Upper Hutt.
A witness said it was trying to lift a slab of concrete at the time.
"The back hoist was lifting up a big slab of concrete and it was too much weight for it, and it flipped it up, straight in the air, and that was it."
Another witness told the Herald, they understood the crane was lifting concrete window panels when it lost balance.
A truck has tipped up on its end outside the New Zealand Campus of Innovation and Sport in Upper Hutt. Photo: RNZ/Samuel Rillstone
About 30 people are gathered outside taking photos and videos, mostly tradies from Real Steel.
On social media one person quipped "ya can't park there mate".
A spokesperson for the Gillies Group said all proper procedures were followed following the incident and no one was hurt.
Cranes have now arrived to recover the truck.
The spokesperson said it would likely take some hours before the truck could be put back on its wheels.
WorkSafe was investigating, she said.
A truck has tipped up on its end outside the New Zealand Campus of Innovation and Sport in Upper Hutt. Photo: RNZ/Samuel Rillstone