Military cargo planes landed one right after the other at Kelly Field at Joint Base San Antonio-Lackland, dropping off heavy equipment.
Aerial footage showed humvees being unloaded as the cargo planes lined up alongside the runway. Immediately after the equipment dropoffs, the cargo planes would take off again.
While it's unknown if the activity is directly related, the Trump administration has ordered troops to deploy to the U.S.-Mexico border in anticipation of the migrant caravans heading north through Mexico and Central America.
“We are bringing military police units. We are bringing strategic air lift to bare. As we sit right now we have three C-130s and a C-17 what is ready to deploy CBP personnel where ever they need to be at anytime,” said General John O’Shaughnessy of the U.S. Northern Command.
"We will treat intending migrants humanely and professionally at all times and the safety of CBP personnel especially our law-enforcement personnel on the front lines as well as the traveling public will remain paramount," said Kevin McAleenan, commissioner of U.S. Customs and Border Patrol.
It was also confirmed this week that U.S. Army soldiers are traveling to San Antonio before continuing to the southern border.
This is a developing story. Check back as updates become available.