The safety problems affecting Chinese goods spread from toys to textiles on Monday as New Zealand said it would investigate allegations that imported children’s clothes contained dangerous levels of formaldehyde.

The government ordered the probe after scientists hired by a consumer watchdog programme discovered formaldehyde in Chinese clothes at levels of up to 900 times regarded as safe. Manufacturers sometimes apply formaldehyde to clothes to prevent mildew. It can cause skin rashes, irritation to the eyes and throat and allergic reactions.