There have been scenes of chaos at some of the shops staging a British version of the Black Friday sales.
Sales began at midnight in stores up and down the country, leading to clashes between shoppers frantic to grab a bargain.
One Tesco was closed after just half an hour, because of fighting.
Asda spokesman Andrew Moore says the response was far bigger than anyone expected.
"Some customers were unfortunately involved in an incident we can't condone.
"We've got some learning to do. This is the second year we've done it."
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