The retail giants affected by the scandal put out statements, with a Sainsbury's spokesperson claiming that the safety of products is the store's priority. They had arrived in the western city of Timisoara from Germany. Authorities will incinerate the eggs.
In 2016, Germany produced more than 12 billion eggs, of which 2.2 billion were exported.
The eggs scandal spread to new countries on Thursday, including into eastern Europe for the first time as a tonne of contaminated egg yolk was found in Romania, and 21 boxes of the tainted eggs were discovered in Slovakia. The batch posed no threat to consumers, it added.
The imported eggs were not whole, shell eggs, but cooked chopped eggs used in sandwiches and salads. The remaining minced meat has been destroyed.
Nikolas Hove from the Danish Veterinary and Food administration assured the public that although the levels of Fipronil found in the eggs are illegal, there are no urgent health risks.
Some national regulators have voiced concern that eggs contaminated with the insecticide Fipronil, which can harm the kidneys, liver and thyroid glands, have entered the food chain, mainly through processed products such as biscuits and cakes.
Dutch police spokeswoman Marieke van der Molen said: "It relates to two managers at the company that allegedly used the substance (fipronil) at poultry farms".
It insisted there is "no need" for people to stop eating eggs.
"As this represents 0.007% of the eggs we consume in the United Kingdom every year, it remains the case that it is very unlikely that there is any risk to public health from consuming these foods", the statement said.
Belgian media reported on Tuesday that the country's Agriculture Minister Denis Ducarme accused Dutch authorities of failing to warn European Union countries about egg contamination after it had been allegedly revealed by the country back in November 2016.
While numerous affected products had a short shelf-life, and would have already been eaten, there were still some products that were within expiry date, the FSA said.
A Food Standards Agency spokesman said today: 'Investigations into the Fipronil incident in Europe continue.
Prosecutors said they are suspected of threatening public health and possession of a prohibited pesticide.
The raids in the Netherlands were carried out as part of a joint action with Belgian authorities. She did not provide details on which companies or individuals were targeted.
He added: "That is exactly what I have discussed with the German, Belgian and Dutch ministers this week".
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