A third person has been charged in connection with a June assault at Warkworth Institution that left two people seriously injured.
The June 10 incident resulted in ORNGE Air transporting one person to a local hospital and another to Toronto.
Northumberland OPP say a 34-year-old from Loyalist Township was charged earlier this month while a 20-year-old from British Columbia was charged on Tuesday.
On Thursday a third individual was arrested.
The 37-year-old from Renous, New Brunswick is charged with aggravated assault and carrying a concealed weapon.