India, May 21 -- Authorities in Mountainair are investigating a deadly incident involving an unidentified substance that left three people dead and 19 others hospitalized, including several first responders who became ill after arriving at the scene.

According to The Mirror US, law enforcement and emergency crews responded to a residence Wednesday following reports of possible overdoses.

When officials entered the home, they discovered that three of the four occupants had died.

Officials said 18 of the 19 people hospitalized were emergency personnel who came into contact with the unknown substance while responding to the scene.

Several responders reportedly experienced symptoms including dizziness and nausea after exposure. Authoritie...