Two boys, aged 14, have been charged with conspiracy to murder after being arrested by counter-terror police in North Yorkshire.
The teenagers were arrested on 28 October, and police were able to extend their detention under counter terror laws.
Both have been charged with conspiracy to murder and one faces another charge of aggravated burglary.
They are due to appear in custody at Leeds Magistrates' Court on Thursday.
On 30 October, Assistant Chief Constable Phil Cain, of North Yorkshire Police, said: "North Yorkshire Police are supporting officers from the North East Counter Terrorism Unit with their investigation and searches.
"Officers believe that this is an isolated incident and the wider community is not at risk.
"We appreciate the cooperation of local residents whilst the investigation continues."
After the arrests, Chris Byrne, headteacher of Northallerton School and Sixth Form, reassured parents in a letter saying safety of the school was "paramount".
A statement from North Yorkshire County Council last week said: "Northallerton School and Sixth Form College is supporting the police in their investigation.
"Police continue to investigate with an open mind to establish what, if any, offences have been committed.
"The school understands that parents and carers may have concerns as a result of these arrests.
"We would like to reassure them that the safety of the school is paramount and we are working with the police to support our students and prioritise their safety at all times."