Dozens of people in the UK died after buying a poisonous substance from a seller in Canada, who is accused of helping people to take their own lives.
Ednews informa via BBC that the National Crime Agency (NCA) could not confirm the chemical was the direct cause of the 88 deaths but has launched a criminal investigation.
British police have been making welfare visits to hundreds of addresses to trace buyers across the country.
Kenneth Law was arrested in Toronto in May, accused of assisting suicide.
The 57-year-old is thought to have run a number of websites selling equipment to assist suicide.
Canadian authorities believe he sent 1,200 packages to customers in more than 40 countries, though it is not known how many included the poisonous substance.
BBC News is not naming the chemical allegedly sold by Mr Law.
Peel Regional Police said they began investigating the case in April following the sudden death of an adult in the Toronto area.