The number of attacks on school staff in Dundee rose by more than a third last year.
The numbers of incidents increased from 392 in 2014 to 548 in 2015 — a rise of 39%.
Responding to the figures, Chris Keates, general secretary of the National Association of Schoolmasters Union of Women Teachers (NASUWT), said violence against staff was among its members’ “top concerns”.
She said: “Where violence occurs, schools should operate a zero-tolerance approach, sending a strong message to pupils and local communities that such behaviour has no place in schools and will not be tolerated.
“In too many schools there is still unacceptable pressure on staff not to report assaults to the police or even to their union so that they can receive help.
“This is a frequent concern raised by primary school teachers.
A Freedom of Information request revealed just under 10% of attacks in city schools since 2014 involved a weapon and there has been at least one attack classified as “sexually motivated” in each of the last three years.
Children and families services convener Councillor Stewart Hunter said that the council takes the issue of violence against teachers “extremely seriously”.
He added: “Staff should be able to work without fear of attack and are encouraged to report any incidents of violence.”