Two people remain in the hospital after 11 people were sickened by carbon monoxide in Morris County.

The Morris County Prosecutor’s Office says that two of the victims are recovering in Jacobi Medical Center in the Bronx. The rest have been treated and released.

Authorities say that the Fennimore Court home had carbon monoxide readings of 1,600-parts-per-million. A normal reading is zero.

“Sixteen-hundred is very lethal,” says Morris County Fire Chief Robert Flanagan.

Chief Flanagan is not involved in the investigation, but says that while carbon monoxide poisoning is typically seen in the winter, it can just as easily happen in the summer.

“Because any appliance in your house that actually creates combustion, if not properly ventilated, can create the carbon which we just mentioned can be lethal,” Flanagan says.

It was not immediately made clear what caused the carbon monoxide to build inside the family’s home. It was also not clear if the home had carbon monoxide detectors.

Emergency officials were called to the home around 7:30 p.m. Monday. 

Neighbors were alerted to the emergency by family dogs acting strange. That prompted a call to the homeowner, who was not around. When he tried calling his family inside, no one answered.

The man raced home and found his wife and four children unconscious. Neighbors Melanie Milo and Afom Nwandu say they were out for a walk when they got to the house and saw the father removing the two youngest children from the home.

"We were probably the first people he had seen, so as soon as he saw us he started asking for help, ‘help me, please help.’ I was at first shocked and I just started running toward him in the house," says Milo.

The neighbors and emergency responders were able to get all of the family members out of the home.

The neighbors and three police officers were also treated for carbon monoxide exposure.