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Mystery Substance Kills Three in NM
21 May
Summary
- Three people died in Mountainair, New Mexico, from an unknown substance.
- Dozens of first responders became ill after responding to the scene.
- New Mexico has a high rate of drug overdose deaths.

An investigation is underway in New Mexico after a mysterious substance led to the deaths of three people in Mountainair. First responders were called to a suspected drug overdose Wednesday, finding four people unresponsive in a home. Three of those individuals died, while a fourth received hospital treatment.
Following their arrival at the scene, several first responders reported symptoms including coughing, vomiting, and dizziness. Nearly two dozen individuals, primarily responders, were decontaminated and medically evaluated. The town's mayor dismissed carbon monoxide or natural gas as causes, suggesting drugs were involved, though the specific substance remains unidentified.
New Mexico State Police confirmed there is no ongoing public threat and investigators do not believe the substance was airborne. This incident occurs as New Mexico faces a significant challenge with drug overdose deaths, ranking fourth nationally according to recent CDC data.