College Station has reopened following an earlier evacuation due to a chemical hazard, according to Toronto police.

Around 5:30 p.m. Wednesday, police and the TTC received reports that a “noxious substance” was released in the station, making people sick.

The substance was later discovered to pepper spray, which is illegal to carry in Canada except for police officers. Once the substance dissipated and police no longer believed there was a public health concern, the station reopened and regular subway service resumed.

Toronto police spokesperson Const. David Hopkinson said one person in the station at the time was treated in hospital.