LONDON (Reuters) - Mondelēz International (MDLZ.O) is recalling Cadbury’s Little Robins biscuits from shelves in the UK and Ireland after a small number of the chocolate bars were found to contain milk powder, the U.S. multinational said on Tuesday.

FILE PHOTO: A man walks past a display board showing snack brands at a Mondelēz International Cadbury's factory in Harlow, Britain, January 8, 2019. REUTERS/Peter Nicholls/File Photo

Mondelēz said a limited batch of its Little Robins Bar had been mistakenly packed with milk powder.

The firm said its investigation had found a co-packer had distributed the product with an incorrect ingredient, which may have resulted in a minor residue.

“Our teams are working around the clock to ensure the production process is being reviewed thoroughly to ensure no further products are impacted,” Mondelēz International said in a statement.

It said Cadbury’s Little Robins bars would be refunded, but did not say how many bars had been withdrawn.

The company’s milk powder is sourced from Europe.

Milk powder is currently subject to a U.S. crackdown by U.S. authorities after large-scale packaging fraud. The scandal has led to increased scrutiny on cross-border food supply chains, especially when it comes to ingredients that can trigger allergies.

Earlier this year, Kraft Heinz (KHC.O) was forced to recall thousands of products made with its Oscar Mayer barbecue sauce, some of which contained soy, a known allergen to some people, after images of children collapsing in milk powder-related distress appeared online.

Mondelēz sells Cadbury’s Little Robins in Britain and Ireland under the Cadbury’s name and in other European countries under the Truffles name.

The Cadbury name, originally a Greek word meaning “seven little gold spoons”, was licensed by Anglo-Dutch food group Cadbury Schweppes in 1998 to help Mondelēz roll out its global snack and confectionery business in the developing world.

Mondelēz is part of Kraft Heinz, which was created when the food giants combined in 2017.