Education chiefs in Inverness are investigating after a pupil believed to be just six had a knife in school.
However, a teacher was quickly informed and confiscated the blade.
Highland Council is treating the incident as an “internal matter” and police are not involved.
A spokeswoman for the authority said: “We are unable to comment due to pupil confidentiality and we do not comment on personnel matters.
“This is an internal matter for the school/education authority and is not a police matter.”
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But one parent, who did not wish to be identified, accused the school and council of trying to “cover up” the incident.
They added: “I am concerned if this six-year-old will turn the knife on our son/daughter.”
Over the last two months, two schools in Aberdeenshire have dealt with similar incidents – both involving young primary school pupils.
An eight-year-old from Deeside was reported to the youth justice management unit after brandishing a knife last month, while an Ellon Primary School pupil was reported for similar behaviour in September.
Figures obtained by the Press and Journal last month revealed more children in the north-east were found with blades than in any other part of the country.
There were 26 youngsters in Aberdeen, Aberdeenshire and Moray were caught with weapons ranging from knives, razor blades and scissors in 2017-18, while there was just one recorded in the Highlands.
However police insisted Grampian’s rate was so high due to the system they have in place with local authorities and schools to crack down on knife crime since the death of Aberdeen schoolboy Bailey Gwynne.
More north-east schoolchildren were found with blades last year than in any region
He was stabbed to death by another pupil in the school corridor during a row in October 2015.
Since then councils across Scotland have committed to educating pupils about the dangers and consequences of weapons.
Last night, Inverness Loch Ness-side councillor Ron McWilliam said: “Knife incidents in our schools are incredibly infrequent and both school staff and police are well trained in dealing with them.
“Pupils generally understand the seriousness of carrying knives and I am confident that in the event a child makes such a mistake that teachers will respond appropriately. Every situation is different and I know of no incident recently where any menace was intended or caused.”
