More than a 100 guests have been evacuated from a hotel in northeast Calgary as crews due to a carbon monoxide call.

Emergency crews were called to the Emerald Hotel & Suites near Sunridge Blvd and Barlow Trail NE just before 2 p.m. on Thursday afternoon.

Calgary Fire says crews were initially called to the hotel for a medical incident involving two people found in the basement. Once on scene, crews detected carbon monoxide readings exceeding 300 ppm, a level considered immediately hazardous, prompting a full building evacuation.

Around 120 people were evacuated. Two people were taken to the nearby Peter Lougheed Hospital in stable condition, paramedics said.

With temperatures outside well below freezing, many evacuees have been gathered in the hotel lobby while awaiting Calgary Transit buses to provide temporary shelter.

A CityNews reporter at the scene described “alarms still blaring, people inside the hotel waiting in the reception area,” as firefighters continued to sweep the building.

Crews remain on scene searching for the source of the high CO levels.

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