An organ delivery car on an emergency blue-light trip was hit by a brick which smashed the windscreen.
The incident happened as the car was driving southbound on the A38 at the Toyota Island at 6 pm on Monday 15 May.
Fortunately, the driver, who was making an emergency delivery, was not physically hurt, however, significant damage was caused to the windscreen by the brick which is believed to have been thrown from a bridge above the dual carriageway.
Anyone with information that may be of use to officers is asked to contact Derbyshire police on 101 including reference 23*294942.