A man poured the contents of a fuel container over a supermarket worker and threw diesel at staff and shoppers during an “extremely frightening” armed robbery at a Lidl store.
Police said the man entered the supermarket in Dowlais, Merthyr Tydfil, in South Wales at around 5.15pm on Saturday.
Officers said he had a fuel container and he “poured the contents over a member of staff, demanding cash from the till”.
Other employees and members of the public were also threatened and had diesel thrown at them.
Around £500 was stolen, while South Wales Police have recovered several items for forensic examination.
Detective Sergeant Tony Watts said: “This was an extremely frightening incident for staff and shoppers at the Lidl store.
“Extensive enquiries are ongoing to identify and arrest the person responsible.”
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The force has asked anyone with information to contact police.
Sky News has asked Lidl for a statement.