A teachers' union is calling for more action to tackle violent behaviour in schools after an incident at Johnstone High last week.
Police were called to the Renfrewshire school at around 10.45am on Friday after three teachers and a 14-year-old girl were injured during the disturbance.
A 16-year-old girl has been charged in connection with the incident, which saw three teachers - aged 34, 48 and 59 - taken to the Royal Alexandra Hospital in Paisley.
Mike Corbett, The NASUWT's Scottish official, told BBC Scotland that recent figures showed a rise in serious incidents of threatening or violent behaviour at schools.
He said: "Management in schools need to give better support to teachers when they have suffered an incident of violence or a threat.
"There's a patchy picture - some schools are very good, but far too many are not.
"The government needs to do strong messaging and say it understands behaviour has got worse, and it is willing to commit time and resources to help schools address that."
Education Secretary Jenny Gilruth told the union's conference in Aberdeen that such events were "outwith the norm", but acknowledged that pupils and staff needed support.
"The graphic videos that we've seen in the press in recent times are completely unacceptable," she told delegates.
"But we need to recognise that our schools are dealing with real challenges at the current time.
"There is no place for that type of behaviour in our schools."
READ MORE: Police issue update after man's body found in Johnstone
Ms Gilruth said there had been a "huge increase" in young people with additional support needs, adding: "I want to work with you on how we can better support staff wellbeing but also meet the needs of our pupils.
"I expect there to be policies in place in every school in Scotland to help support our pupils and support you, our staff."
Following the incident at Johnstone High, Renfrewshire Council confirmed the school was operating as normal and senior staff were providing support needed to those impacted.
A spokesperson said: "There was an incident at Johnstone High School today on Friday, May 12 involving a former pupil.
"A pupil and three teachers were injured and received appropriate medical treatment. Police Scotland attended immediately and enquiries are ongoing.
"The school continued to operate as normal and senior staff are providing any support needed to staff and pupils impacted by this incident."
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