A man aged in his 40s has died following the reported gas leak at the Carlsberg factory, police confirmed on Wednesday night.
Another man is in a serious but stable condition, police said.
In a statement, a spokesman for Northamptonshire Police said: “A man in his forties has sadly died following an incident earlier today at Carlsberg, Northampton.
“A 51-year-old man who was taken to hospital is in a serious but stable condition.
“Other staff from Carlsberg and emergency service personnel remain at the hospital receiving treatment.
“The emergency services were called to Carlsberg at around 12.30pm today following reports of a gas leak,” the spokesman added.
Northamptonshire Police are working with the Health and Safety Executive to investigate the incident.