Toronto police say a mysterious safe left in a bus shelter in east Toronto on Thursday isn't dangerous.

Police still aren't certain how the safe wound up in the TTC bus shelter at 340 Donlands Avenue, near O'Connor Drive.

Police cordoned off the shelter and called in the chemical biological radioactive, nuclear, and explosives team to investigate. The specialized team quickly determined the safe poses no risk to the public.

It's unclear what was in the pad-locked safe.