"Mars Chocolate is carrying out a voluntary recall of chocolate products of Mars, Snickers, Milky Way and Celebrations after a bit of plastic was found in a product," the company said in a statement on the recall in Germany.
Products with a best before date from June 19, 2016 to January 8, 2017 have been affected, it said.
The company said a full list of affected products could be found on its website www.Mars.De but the site appeared to be down in the early afternoon.
The US giant's Dutch subsidiary also issued a call-back for similar products with the same expiration dates, Dutch news agency ANP said.
The products covered by the Dutch recall were all made at a factory in Veghel, in southern Netherlands, ANP said.