Amazon's 'frequently bought together' feature suggested a 14-year-old buy a knife with his school rucksack, his police officer father has revealed.

Alister Bonafia, from Kettering, Northamptonshire, was searching for a backpack online while getting ready for the start of a new school year.

But after adding a £22.99 'college school bag' to his virtual basket, the website offered him a large kitchen knife to go with it.

Alister immediately told his father Wiz, a special constable with Northamptonshire Police. The 42-year-old was furious when he heard what had happened.

"As a parent I was shocked and worried how easy it looks for my 14-year-old son to buy a knife and how normal Amazon are making it look," he said.

"As a Special Constable that sees how knife crime is impacting communities in Northamptonshire, I'm even more shocked.

"I've been to stabbings and robberies at knife point before - the effect on the victims and wider communities are horrendous.

"We all have to play our part in reducing knife crime, Amazon is no exception."

He added: "I have had a chat with Alister about knife crime and what he should do if faced with a knife, so he knows the gravity of knife crime."