A 17-year-old boy was allegedly found to be in possession of a loaded handgun while on a TTC bus in Brookhaven over the weekend.
TTC employees called Toronto police officers to the area of Jane Street and Tretheway Drive at around 2 a.m. on Saturday to investigate the teenager.
Officers said the boy was on TTC property at the time.
Police entered a bus in the area and, upon investigation of the boy, a loaded .40 calibre semi-automatic pistol was allegedly located.
The teenager was arrested at the scene and is now facing a total of 13 charges.
The boy cannot be identified under the terms of the Youth Criminal Justice Act.
He was scheduled to appear in court on Saturday.