Thousands of parents across Bristol are being asked to repeat the “stranger danger” message to their children.
The city council has sent a warning letter to every school in the city, after one attempted abduction in St George and reported cases in other areas.
It is not known how many schools have sent the letters out, but dozens including primary, secondary and nursery schools have already done so.
The letter urges parents to “repeat the warning” and “underline the seriousness of the incidents”.
It follows the attempted abduction of a 10 year old boy outside Air Balloon Junior School at 8.15am last Friday.
There have now been other reported cases in South Gloucestershire and in Windmill Hill. However police have not confirmed the details of these as they say they are still investigating whether they are genuine.
In each case, a red or silver BMW has been reported to be involved.
Its driver is believed to be an asian man in his thirties with long hair.