LITCHFIELD, Conn. — Connecticut State police say they're investigating four untimely deaths in relation to heroin overdoses.

In a statement sent out Saturday evening, officials said the overdoses have been reported in Litchfield County over the past nine days, with heroin paraphernalia found at each scene.

State Police Trooper Kelly Grant says it is unknown if any of the consumed narcotics were contaminated "by any substances unknown" to the deceased.

Grant recommends knowing the symptoms of an opioid overdose, including slow or stopped breathing; blue skin or fingernails; reduced heartbeat; a limp body, or a person unable to be awakened or roused.