A boy has been arrested after he and a 14-year-old girl appeared in a pornographic video, which was then posted on Facebook and is believed to have been seen by thousands of their fellow schoolchildren.The 14-year-old boy, from Cheltenham, appeared in the video alongside the girl, who is from the Forest of Dean, Gloucestershire.Police say the video, which they describe as pornographic, may have been seen by thousands of children across the county.The film has now been removed from Facebook - but police warn it could have been distributed more widely on the internet.The boy was arrested for making and distributing an indecent image and has been given a final warning by police, meaning the incident will remain on his record for the next six years.'Sex tapes' have become more widespread with the rise of the internet which has added more notoriety to the concept.