The Omaha Fire Department was called to a home after a woman found her elderly parents unresponsive; both suffering from carbon monoxide poisoning.

Officials say the woman had called her parents, but did not get an answer. She went to check on them and found both unresponsive inside their home near 120th and Frances Street.

Tuesday night Paul Grizzard was listed in critical condition. His wife, Joan Grizzard was in serious condition.

The daughter told firefighters when she arrived at the house there was a strong smell of gas. The car was not running by the time firefighters arrived, but they believe it had run out of gas.

Firefighters took a carbon monoxide reading of the home after the doors and windows had been open for some time. It registered at 140 parts per million.

A spokesman for the Fire Department tells Channel 6 News the average home should have a reading of 9 ppm. If a home detector registers over 14 ppm, we should get help immediately.

The Fire Department offers free CO detectors. For more information, call 444-3560.