Co-op stores have issued an urgent recall on more than 165,000 Chocolate Santas, after two alleged tampering incidents.
A spokesperson for the Co-op said two of the hollow chocolate figures had been found to contain a small button-cell battery.
"The health and safety of our customers is our top priority," said the spokesperson, saying that the Co-op was investigating and the police and Food Standards Agency were being notified. No other products are known to be affected.
The BBC reports that the chocolates that had been subject to tampering were found at two different locations, one in Suffolk and one in Essex.
The Co-op said customers with one of these products should not eat it, but call the company's customer relations team for a full refund, and anyone who is concerned should call Freephone 0800 0686 727.
EDIT: The recall has now been uploaded to the co-op website and you can read it here.
Whoever has done this is doing it to cause disruption and to take focus off a festive period and they have done that however on the side of co-op at least they have become aware of the situation and are doing something about it