Police say they are working closely with the school following the incident on Monday 10th December.
Officers were called into St Michael's C of E in Heavitree on Monday.
The knife was not taken out of the child's bag until it was confiscated by staff at just after 9am.
Body found in Bideford fire investigation
Three teenagers currently on bail
Royal Clarence Hotel redevelopment to start
Work to start on historic city centre building
Road closures for Tar Barrels event
Organisers list road closures and residents-only access.
More redundancies at Devon shipbuilder
Redundancies could include managerial roles.
Devon's fire service change alarm response
Changes could save hundreds of thousands of pounds.
Exeter woman averts disaster at Greek airport
Exeter woman hailed 'a hero'.
