Is it a disgruntled driver?
Fourteen Tesco supermarkets across the country were closed in what some reports said was a bomb scare.
Police refused to give details of the incidents, beyond saying the “safety alert” was a precaution. Officers from Hertfordshire, where the firm has its headquarters, said no-one had been hurt.
The force said they had launched a criminal investigation following a series of threats made to the stores.
Police said the closures affected stores in Lancashire, Suffolk, Dyfed Powys in Wales, Fife and Strathclyde in Scotland, Leicestershire, Humberside, West Mercia, West Yorkshire, Nottinghamshire and London.
A spokesman for South Wales police said the Tesco store at Riverside, Port Talbot, had been closed. “Officers will maintain a presence at the site for as long as is necessary.”
Towns where stores have been confirmed to have closed were Barrhead in East Renfrewshire, Fife in Scotland, Pontefract in West Yorkshire, Market Harborough and Ashby-de-la-Zouch in Leicestershire and Bury St Edmunds in Suffolk.
Eyewitnesses said the stores started shutting in the early afternoon, with at least two people claiming they had been told the closures were due to a bomb scare.