A stunt woman died on the set of the Deadpool 2 movie, police said.
Witnesses said that a female motorcyclist crashed her bike in the Jack Poole Plaza in the Canadian city of Vancouver. She reportedly went airborne before crashing through glass at Shaw Tower.
Onlookers originally thought that the crash was a choreographed part of the filming, but soon realised that the incident was unintended.
Some witnesses reportedly said the stunt driver may not have applied her brakes before the crash.
"Vancouver Police can confirm that a female stunt driver has died on the set of Deadpool 2 during a stunt on a motorcycle," police said in a statement.
More information on what caused the stunt to go so catastrophically wrong was not available.
Witnesses to it described a chaotic scene.
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"People were running on the sidewalk, the motorcycle comes flying across the street, looks like from a ramp because it was in the air," one told Global News.
The rider was "standing on the bike, slams into that building, clearly... out of control and clearly not planned."
Deadpool 2 has a scheduled release date for June 2018, and it is unclear if this incident might affect those plans.
Production of the film, which stars Ryan Reynolds and Josh Brolin, began in June.
The Deadpool 2 accident is at least the second stunt mishap on a major film set in as many days.
Just a day before, Tom Cruise injured himself on the set of Mission Impossible 6.
Cruise, 55, hurt his leg in London after falling short of his mark and hitting a building.
He was later seen limping away before collapsing.
He then limped back to the edge of the building before being pulled away by safety team crew.