Police and fire officials first arrived on scene around 10:20 p.m. at 201 Babbitt Road after receiving a call of smoke in a building and found excessive carbon in the residence, said Bedford Hills Sgt. J. Evans.
Evans said at least 40 people were inside the multi-family home.
Several people were treated for carbon monoxide poisoning at Northern Westchester Hospital, officials said.
The house, which has been deemed unsafe until the boiler is fixed, left more than 30 people without a place to stay, said Abagail Adams, spokeswoman for the Red Cross.
"We will be helping them find housing and tracking them to make sure they are okay," Adams said.
Bedford Hills building officials are checking the home to see if there were any violations or too many people living at the home, Evans said.
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