Unknown Substance Kills 3 and Sickens Dozens in Rural New Mexico

Three people died and nearly two dozen individuals underwent decontamination on May 20 after first responders in rural New Mexico were exposed to an unknown substance while responding to a call at a residence near Hanlon Avenue and Pinon Street around 8 a.m., according to authorities.

Officials said the incident was initially believed to involve a possible drug overdose, though investigators have not yet publicly identified the substance involved.

New Mexico State Police said emergency crews found four people unresponsive inside a home in Mountainair, a small town east of Albuquerque. Three individuals were pronounced dead at the scene, while a fourth person was transported to a hospital in Albuquerque for treatment. Authorities have not publicly released the victims’ identities.

Several first responders later became ill after arriving at the residence. Officials said symptoms included nausea, dizziness, coughing and vomiting. According to University of New Mexico Hospital, most of the affected responders were treated and later released.

Investigators continued working on May 20 to determine the nature of the substance involved, though police emphasized there was no ongoing threat to the public.

“At the time, investigators believe the substance may be transmitted through contact, and do not believe it to be airborne,” Wilson Silver said.

Antonette Alguire, a volunteer firefighter in Mountainair, said she helped perform CPR on a woman outside the residence before noticing emergency crews becoming ill near a heliport.

According to Alguire, firefighters and EMTs soon began coughing, vomiting and complaining of dizziness after responding to the scene. “It’s getting to that point, where we just have to live in fear, even saving lives,” she said.

Alguire explained that she never entered the home and did not experience any symptoms herself, but described the situation as frightening. She also questioned whether first responders may require stronger protective equipment in the future when handling suspected overdose calls.

University of New Mexico Hospital said nearly two dozen patients were evaluated and decontaminated following the possible exposure. Hospital officials stated that most individuals showed no symptoms and were later discharged, though three symptomatic patients remained under observation.

Law enforcement officers from several agencies stayed at the scene on May 20. Yellow tape surrounded the home along a dirt road, while investigators removed three bodies from the property and loaded them into a white van.

Mountainair Mayor Peter Nieto said drugs were seen at the scene and could have played a role in the deaths. He also said authorities ruled out carbon monoxide and natural gas exposure.

“Tragedy like this is horrific,” Nieto said.

Nieto later talked about his town. He described Mountainair, with a population of fewer than 1000, as a close community deeply affected by the incident. He said Townhall would close on May 21 because of the emotional toll on employees.

Residents also expressed concern online about drug abuse in the area. According to the Centers for Disease Control and Prevention, New Mexico recorded 775 overdose deaths in 2024, which is the fourth-highest rate in the nation.