LUDINGTON, MI -- Police believe heroin recently introduced to Ludington could be more deadly than usual.

According to a release from the Ludington Police Department, emergency responders treated two separate heroin overdoses within a mile of each other on Sunday, which is unusual to occur in close proximity. First, a 24-year-old Ludington man was treated at 2:15 p.m. in the 500 block of North Rowe Street, followed by a 44-year-old man three hours later in the 500 block of East Danaher Street.

Police said it is possible that the heroin that was used by both victims was of a higher potency, or mixed with other dangerous substances.

Narcan (Naloxone) was administered to both overdose victims, who were unresponsive and not breathing. Both victims were revived and transported to Spectrum Health Ludington Hospital and treated.

An investigation will be conducted in an attempt to determine the source of the heroin.