Britain's National Crime Agency said it has identified 232 people in the U.K. who bought products from the websites in the two years until April, 88 of whom had died.
The agency said it was investigating whether any crimes had been committed in the U.K., but that "at this early stage there are no confirmed links between the items purchased from the websites and cause of death in any of these cases."
They are being supported by specially trained officers from police forces," said National Crime Agency Deputy Director Craig Turner.
The probe is part of international inquiries sparked by the arrest of Canadian Kenneth Law, who has been charged with two counts of counselling and aiding suicide.
Law is accused of using a series of websites to market and sell sodium nitrite, a substance commonly used to cure meats that can be deadly if ingested.
Authorities in the United States, Italy, Australia and New Zealand also have launched investigations.
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