Millions of eggs have been recalled across Europe after the insecticide was used as a cleaning product on some European Union farms, despite not being authorised for use near food-producing animals.
The eggs were mostly sold to cafes and caterers, Danish authorities said, stressing that the level of the insecticide in the eggs was too low to pose a health risk to humans.
On Thursday, investigators arrested two people in raids on companies in the Netherlands and Belgium.
In the Netherlands, the country's food safety regulator said two men who are directors of the firm, Chickfriend, were arrested today after raids in the Netherlands and Belgium.
"We can confirm that they are eggs that hail from one of the infected farms in the Netherlands", Nikolas Kühn Hove, a spokesperson for Fødevarestyrelsen, told TV2 News.
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Fipronil is widely used to treat pets for ticks and flees but its use in any part of the food chain, for example to clean out barns, is forbidden.
"'I'm confident that acting quickly is the right thing to do", Heather Hancock, chairman of the UK Food Standard Agency, said Thursday.
However, ChickFriend, a Dutch company, is under investigation for buying the product and treating poultry farms in both Belgium and the Netherlands, according to numerous media reports.
Aldi earlier this month pulled all Dutch eggs from its stores in Germany.
Meanwhile, Belgian Agriculture Minister Denis Ducarme has accused the Dutch authorities of knowing about the problem as far back as November 2016.
Over half a million potentially contaminated eggs were distributed in the United Kingdom, it has been revealed.
With the contaminated eggs starting to surface in countries across Europe, Dutch and Belgian officials are facing growing questions about how the scandal started and whether the public has been kept fully aware.