Seven people were taken to Cheyenne Regional Medical Center Monday morning after breathing in chlorine gas, Cheyenne Fire Rescue says.

CFR spokesman Don Wood says firefighters were called to the Laramie County Sheriff's Office at 10:36 a.m. after someone cleaning the building mixed some cleaners that produced chlorine gas.

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"Once on site, CFR crews isolated the area and conducted air monitoring tests to ensure air quality returned to safe levels and below the permissible exposure limits," Wood said in a press release. "(They) cleared the scene by 11:38 a.m."

Wood says the cause of the incident was deemed unintentional.

"CFR reminds the public to use caution with cleaning chemicals and to never mix chemicals unless a manufacturer’s label specifically allows for it," he said.

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