Security concerns are being raised at some of Canada’s smaller, private airports after a 20-year-old man with mental health issues stole a plane from a small airport in Markham before crashing it in Peterborough last week.

A day after Global News reported the RCMP was investigating national security aspects related to the stolen plane that crashed in Peterborough, Ont. last week, the RCMP has confirmed its national security enforcement unit was involved in the investigation.

Global News has learned the RCMP is now leading the investigation into a stolen plane that mysteriously crashed in Peterborough, Ont. last week and multiple sources confirmed it was being treated as a potential "national security issue."