Officials in Douglas — along the border between Arizona and the Mexican state of Sonora — have declared a state of emergency.

Senior Field Correspondent Nina Kravinsky, a former NPR producer, is reporting from the station's news bureau in Hermosillo.

This is just the beginning,” one Defense official said about the deployment of active-duty troops to the border with Mexico.

Arizona and Texas borders. The administrations of George W. Bush and Barack Obama also sent thousands of National Guard troops to the U.S.-Mexico border during their presidencies in operations ...

The travelers involved were turned over to U.S. Immigration and Customs Enforcement’s Homeland Security Investigations.