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A man was stabbed twice in a "calculated and violent" attack by a stranger he had agreed to meet in order to sell him his laptop, police said.
The victim, in his 40s, was knifed after arranging to meet a man to finalise the sale of a Macbook Pro.
They met at the victim's place of work in Finchley High Road, where the suspect's demand for a receipt before money had exchanged hands left the vendor "uneasy" about the sale.
He tried to walk away, but was grabbed by the suspect who told him he had a knife before grabbing the laptop and stabbing the victim int he back and the shoulder.
![](https://static.standard.co.uk/s3fs-public/thumbnails/image/2017/03/26/13/finch.jpg?quality=75&auto=webp&width=960)
The suspect then fled the scene and the victim was treated in hospital for his injuries.
Detectives have now released CCTV of a man they wish to speak to in connection with the attack on January 14.
![](https://static.standard.co.uk/s3fs-public/thumbnails/image/2017/03/26/13/finch2.jpg?quality=75&auto=webp&width=960)
DC Hussain Ahmed of Barnet Police said: "This appears to be a calculated and violent attack with an element of preplanning.
"The suspect attending the meeting armed with a knife and showed no hesitation of using it to steal the laptop. He has left his victim devastated.
"Whoever carried out this attack is a dangerous man and I would appeal to anyone who recognises him to call police immediately."
Anyone with information should contact Barnet Police or call Crimestoppers anonymously on 0800 555 111.