Tesco has cleared single knives from displays across stores throughout Wales - leaving gaps on shelves.
The move was revealed just days after a man died after he received a stab wound to the chest in a Tesco supermarket car park in Slough.
A spokesman said the supermarket giant no longer sold knives in smaller Express stores or through home delivery, and had been phasing out the sale of them in Tesco Metro stores.
Knives are also being removed from sale in all the large format stores, a statement said.
A notice at the Tesco Extra store in Carmarthen read: "Customer information: These products are currently unavailable. Sorry for any inconvenience."
And knives were no longer on sale at the Tesco Extra in Llansamlet.
One Welsh shopper, Chris Harvey-Jones, said he had been told the store in Pembroke Dock was not selling knives any more.
What's the law relating to knives?:
Mr Harvey-Jones said: "While doing my shopping in Pembroke Dock Tesco... I was looking for a new small vegetable paring knife, as our current one's handle has broken.
"Strange, I thought, I can't see any knives in the kitchen aisle.
"When I asked, I was told that they no longer sell knives of any description 'due to all the stabbings'.
"Not even knife, fork and spoon cutlery sets...
"I'm a middle-aged family man, with no criminal convictions ever, hold enhanced DBS (criminal record check through the Disclosure and Barring Service)... and yet am not allowed to buy a 3" vegetable knife."
A Tesco spokesman said: "We are all aware of the increase in knife crime. As a business we take the responsible sale of knives very seriously and want to make sure we are doing everything possible to keep our colleagues and customers safe.
"We no longer sell knives in our Express stores or through our home delivery service, and have been phasing out the sale of knives in Tesco Metro stores.
"Whilst we investigate and develop enhanced measures around the security and sale of knives, we are temporarily removing single knives from sale from all our large format stores, in line with customer and colleague feedback."
The spokesman said the measures were not as a result of the fatal incident at the Slough Tesco.
But the supermarket has recently trialled using a locked knife cabinet in its Edmonton store in North London.
Removal of single knives from larger Tesco stores is expected to be completed in around 12 weeks, with knife blocks still available.
There have been record numbers of fatal stabbings in England and Wales.
Up until September last year, there were almost 40,000 knife crimes committed, up two-thirds over the last four years.
The Co-Op Group stopped selling single kitchen knives earlier this year, with Asda promising to also remove them from its stores.
But it was revealed today that retailers across the UK are breaking the law on underage knife sales, with some allowing children as young as 14 to buy blades.
Research from the Local Government Association said as many as 60% of shops in some areas were selling knives illegally.
