Officials in the Netherlands say two types of Chinese-made cookies have been found with elevated levels of the industrial chemical melamine.

The Dutch Food Safety Authority said Tuesday the chestnut and chocolate flavored cookies from the "Koala" brand are now off the market because of their melamine concentration. 

New melamine-tainted products are being announced on an almost daily basis.

In South Korea, officials say the chemical was found in Nabisco Ritz cracker cheese sandwiches and in rice crackers made by the Chinese company, Danyang Day. 

Since the melamine scandal broke in early September, more than 50 governments around the world have either banned or recalled Chinese-made products containing milk.

The World Health Organization has issued guidelines to help authorities decide on the health concerns of melamine levels in food. 

Chinese authorities warned earlier this month that tons of melamine-contaminated milk powder were exported to Taiwan.

Already some 53,000 children have been sickened in China and four have died after drinking milk or milk products laced with the chemical.

China's official Xinhua news agency says police in northern China have arrested 27 people in their investigation of the milk scandal.
 
Police tell Xinhua that melamine was being produced in underground plants and then sold to breeding farms and purchasing stations.

The chemical which is used in making plastic, is believed to have been used to make foods such as watered-down milk appear to be higher in protein.