A hazmat situation forced the evacuation of 100 people near Industrial Park in Santa Teresa.

New Mexico authorities said an unknown hazardous materials release has sickened about 200 people near the Mexican border.

A mandatory evacuation that was in effect for one mile around Industrial Park and border crossing at Santa Teresa has been lifted. The nearby airport is currently closed.

The evacuation remains in effect in Industrial Park while air-quality testing is being done to determine what made the people sick.

Evacuees seeking shelter were told to head to Santa Teresa High School, and that temporary shelter has been deactivated, according to Dona Ana County Sheriff's officials. The American Red Cross crews were on hand to provide assistance.

"They put me on some oxygen and I feel better now," evacuee Cesar Gaytan said. "I was coughing, hacking."

Emergency crews at the scene said about 200 people are being treated for exposure to an unknown substance. They said people are being treated for symptoms of difficulty breathing, light-headedness, nausea and dizziness. No serious injuries have been reported, and no one has yet been transported to area hospitals.

The Doña Ana County Fire and Emergency Service Department Hazardous Materials Response Team is at the scene near the Doña Ana County Industrial Park.

Air-quality testing is being done to determine what's making people sick.

"All chemicals are accounted for. There is no spill," Fire Marshall Robert Monsivaiz said.

New Mexico State Police have requested a civil support team from the New Mexico National Guard to assist with monitoring and testing.

A reverse 911 system was activated to alert people in nearby homes and businesses to stay indoors, seal all doors and windows and turn off air conditioning. That advisory has been lifted.