What to know about New Mexico deaths linked to unknown substance

Investigators in New Mexico are trying to identify a mysterious substance that may have contributed to the deaths of three people.

The exposure also led to more than a dozen first responders to be briefly quarantined.

Authorities were called to a suspected drug overdose Wednesday.

They found four people who were unresponsive inside a home in a rural town east of Albuquerque.

Three of the people who were in the home died.

First responders were evaluated after some began coughing, vomiting and experiencing dizziness.

Medical workers checked nearly two dozen people, mostly first responders.

Hospital officials said most experienced no symptoms and were discharged.

Three were being monitored.