Police are appealing for information after a teenager was struck in the face with a sharp instrument on Newark Road in North Hykeham.
The 17-year-old victim was walking with a group of around nine other people between The Forum and Asda supermarket at around 10.30pm on Friday, April 11.
They were approached by a man on a mountain bike who was cycling in the opposite direction.
He confronted the group before attacking the 17-year-old, striking him in the face with a sharp instrument. He then rode off towards The Forum.
The victim was left needing surgery on his left cheek in what police said was an unprovoked attack.
The man suspected of carrying out the attack is described as white, around 6ft tall, of skinny build, aged in his mid-20s to early 30s. He is believed to have been wearing a dark jacket and trousers.
He was seen entering the Tesco Express store on The Forum, North Hykeham, at 10.45pm on that night.
If anyone knows a person matching this description, or saw or heard anything suspicious in the area around 10.30pm on April 11th, they are asked to contact Lincolnshire Police on 101 quoting incident 493.
Alternatively contact the independent charity Crimestoppers on 0800 555 111.
— Update at 9pm: An earlier version of this story featured CCTV images released by Lincolnshire Police of a man they wanted to speak to in connection with the incident. Since, the man in the images has contacted police and has been identified and eliminated from the enquiry. He was not involved in the incident he did not witness it. The images were replaced as soon as we were notified.