Three people were found dead in a home in Butler County due to suspected carbon monoxide poisoning, authorities said. First responders were called to a home on College Street in Butler at around 5 p.m.

Authorities believe carbon monoxide poisoning caused the deaths of three people found in a western Pennsylvania home this week, but investigators have yet to determine what led to the deadly exposure.

One man is dead and another hospitalized in critical condition after they were found unresponsive last week in an Almont Township pole barn, police said. An autopsy revealed carbon monoxide poisoning was the cause of the death,

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