A central Hamilton Tim Hortons is undergoing "decontamination" today, police say, after a bear spray incident sent several people to hospital.

The incident happened shortly after noon, at the Tim Hortons location at 200 Barton St. E.

In a news release, police said two "younger males" walked inside and "sprayed an unknown substance in the air."

Seven customers and staff were affected and needed medical attention police say.

"The victim's symptoms were consistent to a reaction from bear spray," the news release reads.

The suspects were last seen running southbound from the area.