Police in South Gloucestershire are appealing for information following three recent incidents of schoolchildren being asked by a man in a car if they wanted a lift.
It is important to stress that none of the children interacted with the suspect and the driver left the scene without committing a crime.
Police say they believe the three reports may be linked, but at this stage do not think they are connected with similar reports in North Bristol.
They happened on Wednesday 10th December at Redwick Road in Pilning at 7.30am, in Greenways Road in Yate at 12.45pm and in Thornbury Road, Thornbury at 4.15pm. In each case, a man in a small blue hatchback stopped and asked the children if he could give them a lift.
Avon and Somerset police say they are taking the reports seriously and have increased police patrols in those areas around school start and end times, and have been liaising with schools and other partner agencies.
Parents and children are asked to be aware, never to accept lifts with strangers, and to tell an adult or call police immediately should they be approached.
Anyone with information on these incidents should contact the police immediately on 101 or Crimestoppers on 0800 555 111 where information can be left anonymously.