A stuntman has suffered serious head injuries while filming Fast & Furious 9 at Warner Bros Studios in Hertfordshire.
An air ambulance and police were called to the studios in Leavesden shortly before midday.
The man was injured in a fall at the site, which has been used to shoot films in the Harry Potter and James Bond franchises.
Universal said filming had been halted for the day to deal with the injury.
The man was taken to the Royal London Hospital by helicopter, emergency services said.
A spokeswoman for Universal said: "We had an injury on the set of Fast 9 today in Leavesden with one of our stuntmen.
"We have halted production for the day to focus on this situation."
The film stars franchise regulars Vin Diesel and Michelle Rodriguez and is due for release next year.
Other films from the series have been shot at the complex, along with movies from the Mission Impossible franchise.
Hertfordshire police officers were there "to assist and carry out initial inquiries", said a spokesman.
Police are also investigating reports that "foreign objects" were found in food at a cafe on the site last week.