A technician and two homeowners were taken to a Spokane hospital after suffering apparent carbon monoxide poisoning.

Firefighters responded Tuesday afternoon to a home in the Spokane suburb of Mead where a technician working on a gas-fired water heater was found unconscious.

KXLY-TV reports ( http://is.gd/RldE1J) that the first firefighter put on his oxygen mask before entering the home and found extremely high carbon monoxide readings.

After the technician was sent to the hospital, the homeowners complained of flu-like symptoms, which can also indicate carbon monoxide poisoning. They were sent to the hospital as well.

Investigators were trying to determine the source of the colorless, odorless gas that can cause sudden illness and even death.

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Information from: KXLY-TV, http://www.kxly.com/