An Issaquah family of six was hospitalized Nov. 7 after being poisoned by carbon monoxide in their home.

Eastside Fire and Rescue firefighters responded to a Northeast High Street household Saturday morning after receiving a call for medical assistance.

Firefighters identified the symptoms of carbon monoxide poisoning, apparently caused by a car left running in the garage. Firefighters closed the street while they investigated and vented the home.

The family was transported to unspecified hospitals, then Harborview and, finally, Virginia Mason in Seattle for treatment.

Three firefighters were also treated for carbon monoxide poisoning at the house.

Spokespeople writing for the city of Issaquah Twitter account, which initially reported the incident, noted that firefighters did not find a carbon monoxide detector in the home.

In the wake of the poisoning, the city published a series of safety tips on preventing carbon monoxide exposure, such as maximizing ventilation around fuel-burning devices and installing and maintaining carbon monoxide detectors.

Symptoms of carbon monoxide exposure include a dull headache, weakness, dizziness, nausea, vomiting, short breath, confusion, blurred vision and loss of consciousness, according to the Mayo Clinic.