Detectives have launched an investigation after metal was found in food containers at Solway Foods in Corby.
Officers were called to the manufacturers, based in Godwin Road at the Earlstrees Industrial Estate, on Wednesday.
Det Insp Ali Reynolds, of Northamptonshire Police, said: “Police were called to an incident at Solway Foods in Corby at around 1.30pm on Wednesday, following reports of metal being found in food containers.
“A police investigation is underway into the cause of the contamination.
“We are working closely with Solway Foods who have assisted us in every way possible and all employees have been spoken to by police. The robust systems employed by the company ensured that there was never a risk to public health and the matter was safely contained within the production area.
“We are keeping an open mind as to the cause of the contamination, however we are satisfied that the motive was to disrupt the company as opposed to putting anything harmful into the public food chain.”
A spokesman for Solway Foods, said production at the Corby factory was temporarily stopped after the metal was discovered.
She added: “We take the safety of customers extremely seriously.
“As a responsible business, we have stringent food safety measures in place, including metal detection systems, to ensure that no foreign objects can find their way into the food we produce.
“We are currently investigating an issue which resulted in a metal object being identified in the factory prior to packing.
“As a precaution, production was stopped at the factory while internal and external investigations take place.”
Solway Foods employs about 1,400 people between its Corby site and at another in Worksop. The two sites produce more than 1.3 million sandwiches, 500,000 salad meals and over 550 tons of dressed salads every week.
Anyone with information about the incident is asked to phone Northamptonshire Police on 101. Alternatively, phone Crimestoppers on 0800 555111.