There have been more reported incidents of bricks and stones being thrown at buses in Kettering.
At least 12 incidents have been reported to Northants Police since the beginning of December, including ones previously reported by the Northants Telegraph.
Most of the recent incidents have occurred in the early evenings and in the London Road area or surrounding roads.
The most recent event happened at about 5.30pm on Saturday, January 31.
The back window of a bus travelling along Pytchley Road was smashed by a brick.
A number of other buses have also been damaged.
In some of the cases a group of three to five teenagers have been seen in the area.
Anyone with any information should call Northamptonshire Police on 101 or Crimestoppers confidentially on 0800 555111.