A Hawke's Bay man was shocked to find what he says were four pieces of glass in a slice of Value bread he bought from a local New World.
Foodstuffs says it takes food safety concerns seriously and is investigating what appears to be an "isolated incident".
Derek Timu and his family bought two loaves from Flaxmere New World on Sunday and were halfway through the second one when Timu discovered something untoward.
"I bit into the bread and I felt like a chunk of it in my teeth. I pulled it out and it was a clear piece of glass. I was like 'woah'," he said.
Timu said the glass was small in size, about "half the size of a piece of road bitumen", and impossible to see once he'd covered the slice with butter.