GROTON, Conn. (AP) - Police in Groton are investigating after two residents of the southeastern Connecticut town died from overdoses within a 12-hour span.

Investigators suspect that heroin laced with fentanyl was responsible for at least one of the deaths.

Police say officers were alerted to the first death around 7:30 p.m. Tuesday after a group of drivers reported an unresponsive male passenger.

Lt. John Varone says first responders administered a drug used to reverse opioid overdoses to the 25-year-old victim, but he was pronounced dead at Lawrence + Memorial Hospital.

The second victim, a 47-year-old woman, was pronounced dead shortly after first responders arrived on-scene around 9 a.m. Wednesday.

Varone says it's too early to tell if the deaths are connected to several other fatal overdoses that occurred across Connecticut over the weekend.