A Tyneside-based dairy company which employs hundreds of people in the north-east of England has been put up for sale.
Its owners, the Co-operative Group, said it was looking for a buyer for the ACC Milk company, based at Blaydon.
The company, formed in 1972, also has dairies in Stockton and Middlesbrough, on Teesside.
The USDAW union said it is concerned that hundreds of employees are facing an uncertain future.
George Kane of USDAW said: "The only thing that is certain is the uncertainty, unfortunately, because there is no inkling that there is anybody interested.
"There is no inkling whether on not it would be a going concern."
ACC Milk operates six liquid milk processing units and more than 60 distribution centres throughout the North East, Yorkshire, South East, Midlands and South Wales.
An ACC spokesman said the decision to put ACC up for sale follows a strategic review of its milk processing and manufacturing business.
He said: "The dairy industry has gone through significant change in recent years and ACC operates in an increasingly competitive market.
"In these circumstances, the Co-operative Group Board believes this approach to be in the best interests of employees and the business."