More than 700 staff from Airbus Atlantic have fallen ill after the company's Christmas dinner.
According to French healthcare agency ARS, workers from the aerospace group's site in western France were left suffering from diarrhoea and vomiting, BBC reports.
ARS did not provide details about what food might have made people ill at the event, which took place last week, but it did say earlier that diners showed "clinical signs of vomiting or diarrhoea".
Airbus did not respond to BBC's comments.
Airbus Atlantic is a subsidiary of Airbus, the world's largest aircraft maker, and employs 15,000 people in five countries.
An investigation is currently underway to find the source of the mass food poisoning, Airbus told the AFP news agency.
The wider Airbus group employs 134,000 people and provides products and services in the helicopter, space, defence, security and aircraft industries.
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