The merger between supermarkets Sainsbury's and Asda is to be subjected to an in-depth competition investigation, it has been announced.
The Competition and Markets Authority said the tie-up "raises sufficient concerns to be referred for a more in-depth review".
The CMA had taken an initial review of the deal which was announced in April.
The supermarkets have said that grocery prices will fall in both chains as a result of the merger.
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