Lockdown is the term given to protecting children and staff by keeping them indoors, in their classrooms or other safe locations. An example of when a lockdown may be appropriate would be in the event of a direct physical threat to staff and children by an armed person in or around the site premises. 

In most cases this would be a precaution, on notification by the Police, of a threat in the community (Melsonby, 2010/Cumbria 2010). Very occasionally, a threat is present inside the site (Dunblane Primary Site, 1996). 

Two levels of lockdown are provided in this document.