Teachers did not know the killer of a 16-year-old schoolboy regularly carried a knife, council bosses have said.

Bailey Gwynne died at Aberdeen Royal Infirmary after being stabbed through the heart at Cults Academy on October 28 last year.

His killer, who cannot be named for legal reasons, was charged with murder but found guilty of the lesser charge of culpable homicide.

The teenager was also found guilty of separate charges of carrying a knife and knuckledusters following a five-day trial at the High Court in Aberdeen.

On the first day of the trial, Cults head teacher Anna Muirhead said she had warned Bailey’s killer about the dangers of bringing weapons into school several years ago.

Despite her advice, the 16-year-old admitted to police that he regularly carried a knife in an attempt to “be cool”. One witness said they had seen him with a knife “maybe 25 times” before the killing.

But in a statement released on Tuesday evening, Aberdeen City Council said it had never been reported to teachers.

The council said there was “no history” of bullying and “none was reported to the school”, despite witnesses claiming Bailey’s killer was regularly teased for being overweight.

The council said: "The court heard during the trial it was never reported to the teaching staff of Cults Academy that he was in possession of any weapons, had it been it would have been appropriately dealt with and action taken."

The council said it chose not the participate in the No Knives Better Lives anti-knife campaign in 2009 because of the "exceptionally low level of incidents involving knives in Aberdeen schools" and "little or no history of such crime in the city". Eleven of Scotland's 32 local authorities took part.

The council added no new child protection policies have been put in place as a result of Bailey's death.

His killer is expected to be sentenced at the High Court in Edinburgh on April 1.