A supermarket has launched an investigation after a mum claimed her son found a blade inside a pack of Lego cards.

Kirsty Thorne, 27, says she was shocked to discover the sharp object wrapped in a packet from Sainsbury's.

The mum-of-four says her eldest child Harrison, seven, had opened the packet with his teeth but was unharmed by the blade.

Miss Thorne had bought a Lego card collectors' album from the Sainsbury's store in Bybrook, Ashford, which contained two free packets containing eight cards in total.

When her children returned home from school yesterday, they opened one of the packets and found the blade.

Miss Thorne, who lives in Stanhope, said: "They brought over this Stanley blade to me which was still in the packet.

"It was wrapped up in tape, which was stuck to the seal, but it was the perfect size for the pack so it was unnoticeable beforehand.

"I was angry. I have a one-year-old and if it had dropped onto the floor he could've easily eaten it - I was really annoyed."

Miss Thorne returned to the store to complain and was given a £10 gift voucher.

She added: "You shouldn't have to check a pack of children's cards for blades.

"When they came out the albums were so sought after. It's just horrendous.

"Fortunately no one was cut, otherwise this would have been a completely different story."

A Sainsbury’s spokeswoman said the supermarket giant is aware of the complaint.

She said: "We are aware of an issue with a pack of Lego cards.

"This appears to be an isolated and unusual incident which we are investigating with our supplier."