A schoolboy, named locally as Bailey Gwynne, has tragically passed away after he was reportedly knifed by another pupil in his school corridor.
Bailey was taken to Aberdeen Royal Infirmary by ambulance after police were called to Cults Academy at lunch time today.
Sadly doctors were unable to save him and he died in hospital this afternoon.
Police Scotland said in a statement: 'Police Scotland can confirm that following a serious incident at Cults Academy this afternoon that sadly a 16-year-old boy has died.
'The next of kin of the victim have been informed. An extensive investigation is underway and a 16-year-old male has been detained in relation to the incident and is assisting police with enquiries.'
Chief Inspector Graeme Mackie added: 'This is a shocking and extraordinary incident for Aberdeen and firstly our thoughts are with the family and friends of the boy who has sadly lost his life today.
'A full and thorough enquiry is underway has been launched and there will be a police presence in the area for the foreseeable future.
'We are working closely with the education authorities and wider community as I am sure this incident will be felt not only in Aberdeen but much further afield.'
Our thoughts are with Bailey Gwynne's family during this sad time.