The government ordered the recall and a halt to the sale of the products last month. "There has been unacceptable behavior which should be punished", Le Maire told a news conference.
French President Emmanuel Macron deflected blame Thursday in the latest chapter of a dairy scandal that has embarrassed the French government, major supermarkets and a dairy giant.
Some 18 babies were hospitalized late a year ago over the contaminated products, though they all recovered.
Le Maire said initial checks showed recalled products had remained on sale at 91 sites in France, but there were no indications so far that potentially contaminated products had been exported.
Several days later the company recalled 720 more batches of its products.
The recall included products aimed for export to some 30 countries, including to China, and overall represented more than 12 million baby food tins in what Nalet said was the biggest recall Lactalis had ever experienced.
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"Today, no reopening date can be considered until we have correctly and precisely defined the source of the infection and until it is clearly identified and eliminated", the minister also noted, while Lactalis announced a little earlier the implementation of partial unemployment measures for 250 employees of the Cactus Lactalis plant.
Le Maire said the DGCCRF was forced to issue a December 10 recall because Lactalis was too slow to take action.
A number of supermarkets in France, including Carrefour, have removed the products over fears of contamination.
On Dec. 10, Lactalis - one of the world's top manufacturers of dairy products - ordered a recall of 625 batches or almost 7,000 tons of products after almost 30 infants fell sick.
A judicial investigation is taking place in France over the contamination and a group of French parents of affected infants said on Friday that they were considering a joint lawsuit.