GRAND ISLAND, Neb. -- The Grand Island Fire Department is encouraging residents to have carbon monoxide detectors in their homes.

Fire officials said they have seen a sudden increase of calls for service for carbon monoxide poisoning in the last two weeks. 

Grand Island Fire Prevention Division Chief Fred Hotz said it's important to be alert. 

“The thing about CO is that although is not an immediate emergency, it's a secret," Hotz said. "It's silent and it doesn’t smell. And so, you can get sick or start feeling the symptoms of CO, and think you got a flu or something else. You think you’re sick. You don’t know why you’re sick, and the big key is if more than one person immediately starts feeling sick.”

Hotz encourages residents to put a carbon monoxide detector at home.

According to the Centers for Disease Control and Prevention, at least 430 people die in the US from accidental carbon monoxide poisoning.