Police have been called to supermarkets across the UK amid crowd surges as people hunt for "Black Friday" offers.
Greater Manchester Police appealed for calm after attending seven Tesco shops, at which three men were arrested and a woman was hit by a falling television.
The force said the issues were "totally predictable" and it was "disappointed" by shop security.
Tesco said only a "small number" of stores were affected. Police were called in places including Dundee, Glasgow, Cardiff and London.Apparently, Black Friday is no longer strictly associated with Thanksgiving, although it is a bit amusing that the Brits should hold it on a day determined by an American holiday (celebrating people who left Britain to avoid persecution).