A British Airways flight with more than 400 passengers on board was forced to make an emergency landing after almost all of its crew became sick.
The flight from San Francisco to London was diverted to Vancouver a short time after take-off when flight crew reported feeling ill.
Twenty-five crew members were taken to hospital as a precaution. All of them have since been discharged.
No passengers required treatment.
The airline would not comment on the nature of the illness. A spokeswoman for Vancouver Coast Health told The Guardian crew members had been assessed for smoke inhalation.
"We are sorry for the delay to our customers' flight, but the safety and wellbeing of our customers and crew is always our top priority," British Airways said in a statement.
The airline has launched an investigation into the incident.