A number of workers at Littleport Mushroom Farm were taken to hospital after a suspected chemical incident.
Police, ambulance and fire crews were called to the site yesterday afternoon (August 20) after staff started to experience difficulty breathing.
A spokesperson for G's Fresh, who own the site, said: "A few people at the mushroom factory said that they felt unwell so we brought in the emergency services.
"The fire brigade used specialist equipment to test to see if there had been a gas leak but they could not identify anything.
"Normal service was resumed at the site last night."
The incident was contained to the premises and there was no risk to members of the public.
Cambridgeshire Police say that the Health and Safety Executive is now investigating.
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