A large food factory which supplies Asda has been closed following an outbreak of coronavirus.
Staff have been sent home from Forza Foods, in Normanton, West Yorkshire, after 17 workers tested positive for Covid-19.
Wakefield Council confirmed a further 300 staff have been offered tests and have been told to self-isolate at home.
The local authority said it was working with Forza and Public Health England to try to limit the spread of the virus, reports Yorkshire Live.
Anna Hartley, Wakefield Council’s Director of Public Health, said: “We are aware that 17 cases of COVID-19 have been confirmed at Forza Foods Normanton, with further cases being investigated.
“We’ve taken swift action to work with the business, Public Health England and the HSE to help limit any further potential spread.
“300 staff are being offered testing as a precautionary measure and are now self-isolating at home.
“Staff will only return to work when it is safe for them to do so.
“We ask everyone to please continue to follow Government guidance on regular handwashing and social distancing to help keep yourself and others safe.
“If you are displaying symptoms please get a test by visiting nhs.co.uk/coronavirus or call 119.”