Nassau police helped dispatch an unconscious man from an Elmont home to the hospital Thursday morning but when three other residents reported feeling sick less than two hours later, officers evacuated the house and discovered high levels of carbon monoxide, authorities said.

The Fifth Precinct officers had first gone to the home about 7:15 a.m. because a man, 60, was found unconscious there, officials said. The victim was taken to a local hospital.

Then, about 8:50 a.m., officers were called to the house again because two more men, ages 20 and 27, and a woman, 60, reported headaches and nausea, police said.

Officers suspected a carbon monoxide leak, which their department-issued detectors confirmed, police said.

The three later victims were taken to a hospital as well, officials said, and all four were in stable condition late Thursday afternoon.

The Elmont Fire department also confirmed high levels of the gas and vented the house, authorities said.

Police said the carbon monoxide leak was caused by a rotting pipe.

Pfc. Raheen Tyson Heighter, of Bay Shore, was killed in Operation Iraqi Freedom. His mother has made it her mission to aid active-duty service members, veterans, first responders and Gold Star families. NewsdayTV's Virginia Huie reports. Credit: Randee Daddona; Photo credit: Cathy Heighter

'His sacrifice made a difference': Gold Star mother honors son's memory Army Pfc. Raheen Tyson Heighter, 22, of Bay Shore, was the first serviceman from Long Island killed in the Iraq War.

Pfc. Raheen Tyson Heighter, of Bay Shore, was killed in Operation Iraqi Freedom. His mother has made it her mission to aid active-duty service members, veterans, first responders and Gold Star families. NewsdayTV's Virginia Huie reports. Credit: Randee Daddona; Photo credit: Cathy Heighter

'His sacrifice made a difference': Gold Star mother honors son's memory Army Pfc. Raheen Tyson Heighter, 22, of Bay Shore, was the first serviceman from Long Island killed in the Iraq War.

SUBSCRIBE

Unlimited Digital AccessOnly 25¢for 6 months

ACT NOWSALE ENDS SOON | CANCEL ANYTIME