The Barry Callebaut company says its plant in Wieze shut down all production lines as a precaution while the contamination is investigated.
Production has been halted in the world's biggest chocolate plant, run by Swiss giant Barry Callebaut in the Belgian town of Wieze, after salmonella contaminations were found.
A company spokesperson told AFP on Thursday that production had been protectively halted at the factory, which produces liquid chocolate in wholesale batches for 73 clients making confectionaries.
The company said that 72 of the 73 companies have confirmed that they halted deliveries of potentially contaminated chocolate in time to prevent any hitting the shops and were waiting for a response from the last client.
There have been no reports so far of any chocolate consumers being exposed to salmonella, which causes salmonellosis, a disease that causes diarrhoea and fever but is only dangerous in the most extreme cases.
"All products manufactured since the test have been blocked," spokesperson Korneel Warlop said.
"Barry Callebaut is currently contacting all customers who may have received contaminated products. Chocolate production in Wieze remains suspended until further notice."
Most of the products discovered to be contaminated are still on the site, he said.
READ MORE: Nestle offers cash to cocoa farmers to try and reverse past wrongdoing
But the firm has contacted all its clients and asked them not to ship any products they have made with chocolate since June 25 at the Wieze plant, which is in Flanders, northwest of Brussels.
"Food safety is of the utmost importance for Barry Callebaut and this contamination is quite exceptional. We have a well-defined food safety charter and procedures," the firm said.
Belgium's food safety agency AFSCA has been informed and a spokesperson told AFP it had opened an investigation.
An AFSCA spokesperson said investigators would "gather all the information in order to trace the contamination".
The Wieze plant does not make chocolates to be sold directly to consumers, and the firm has no reason to believe that any contaminated goods made by clients have yet made it onto shop shelves.
Swiss group Barry Callebaut supplies cocoa and chocolate products to many companies in the food industry, including industry giants such as Hershey, Mondelez, Nestle or Unilever.
World number one in the sector, its annual sales amounted to 2.2 million tonnes during the 2020-2021 financial year.
The scare comes a few weeks after a case of chocolates contaminated with salmonella in the Ferrero factory in Arlon in southern Belgium manufacturing Kinder chocolates.