A woman received a stab injury while in traffic on Winsover Road in Spalding. The victim was in a white Mazda near the level crossing at the junction with Thomas Street and had her arm out of the window.
There was one car in front of her vehicle and when the barrier began to lift a group of four teenage men cycled past with one stabbing her in the arm.
It is suspected this was caused by something similar to a screwdriver due to the puncture nature of the wound.
The group are described as white, dressed in dark clothing and wearing baseball caps.
They left the scene by heading down Thomas Street and the victim has attended hospital. This incident happened at around 4.10pm.
There are a number of ways to contact us if you witnessed this or have captured dashcam footage:
• By emailing firstname.lastname@example.org – please remember to put the reference incident 333 of 12 September in the subject box
• Via our non-emergency number 101, quoting reference incident 333 of 12 September
• Through the independent charity Crimestoppers anonymously on 0800 555 111 or online at crimestoppers-uk.org