A £1,000 reward is on offer after a speed camera was attacked in the city.
The speed camera on Skellingthorpe Road, Lincoln was attacked at around 3am on Sunday, December 18.
Officers are talking to witnesses who saw the incident take place and forensic evidence has been collected from the scene.
The film from the speed camera was also recovered.
The £1,000 reward from Crimestoppers is in exchange for information leading to the arrest and conviction of persons responsible for this attack.
Anyone with any information can call anonymously on 0800 555 111.