Scotland's biggest teaching union is demanding better recording of violence in schools after it emerged councils could not provide conclusive data to show the extent of the incidents.
The Educational Institute of Scotland (EIS) said it has received reports of rising numbers of violent incidents.
However, the union claims teachers have been discouraged from reporting them.
Disturbing videos of violent fights between pupils have recently been highlighted in the media.
A video of two girls fighting at Waid Academy in Anstruther two weeks ago sparked the debate over violence and bullying in Scottish schools.
