Mountainair, New Mexico — Three people have died after being exposed to an unidentified substance at a residence on 306 Hanlon Avenue, according to Torrance County Sheriff David Frazee.

The incident occurred around 11:00 a.m. when New Mexico State Police responded with the Torrance County Sheriff’s Office, which initially suspected an overdose involving an unknown chemical. Four individuals were found unresponsive at the residence; three have since died, while one was revived using Narcan before first responders began experiencing symptoms.

During the response, 18 first responders were exposed to the substance and transported to the University of New Mexico Hospital for evaluation and monitoring. Two first responders are currently in serious condition.

Mountainair Mayor Peter Nieto stated that officials believe the substance may be narcotics-related but have not confirmed the exact cause. “At this time, we do not know the exact cause,” he said. “However, based on available information, all indications point toward narcotics as a possible factor.”

Nieto added that New Mexico State Police have taken over the investigation and are working to determine what led to two fatalities and medical treatment for others. Authorities confirmed there is no public threat from the substance, which has been ruled out as carbon monoxide or natural gas-related. The New Mexico State Police established a secure perimeter around the residence and confirmed the substance is not airborne. EMS Chief Josh Lewis, who was among the first responders to enter the home, will remain in the hospital overnight for observation.

Nieto emphasized: “Addiction and substance abuse are issues affecting communities all across our state and nation. Lasting change requires family support, accountability, education, and most importantly, individuals who are willing to accept help.”